diff --git a/MANIFEST b/MANIFEST
index 0d6962293..8aca34e0c 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -16,6 +16,13 @@ common/fileops.c
 common/fmt_string.c
 common/lbuf.c
 common/list.c
+common/regress/sudo_conf/conf_test.c
+common/regress/sudo_conf/test1.in
+common/regress/sudo_conf/test1.out.ok
+common/regress/sudo_conf/test2.in
+common/regress/sudo_conf/test2.out.ok
+common/regress/sudo_conf/test3.in
+common/regress/sudo_conf/test3.out.ok
 common/regress/sudo_parseln/parseln_test.c
 common/regress/sudo_parseln/test1.in
 common/regress/sudo_parseln/test1.out.ok
diff --git a/common/Makefile.in b/common/Makefile.in
index 7a0eaa043..6f4989516 100644
--- a/common/Makefile.in
+++ b/common/Makefile.in
@@ -55,7 +55,7 @@ SSP_CFLAGS = @SSP_CFLAGS@
 SSP_LDFLAGS = @SSP_LDFLAGS@
 
 # Regression tests
-TEST_PROGS = parseln_test
+TEST_PROGS = conf_test parseln_test
 TEST_LIBS = @LIBS@ @LIBINTL@
 TEST_LDFLAGS = @LDFLAGS@
 
@@ -72,6 +72,8 @@ LTOBJS = alloc.lo atobool.lo error.lo fileops.lo fmt_string.lo lbuf.lo list.lo \
 
 PARSELN_TEST_OBJS = parseln_test.lo
 
+CONF_TEST_OBJS = conf_test.lo
+
 all: libcommon.la
 
 Makefile: $(srcdir)/Makefile.in
@@ -85,6 +87,9 @@ Makefile: $(srcdir)/Makefile.in
 libcommon.la: $(LTOBJS)
 	$(LIBTOOL) --mode=link $(CC) -o $@ $(LTOBJS) -no-install
 
+conf_test: $(CONF_TEST_OBJS) libcommon.la
+	$(LIBTOOL) --mode=link $(CC) -o $@ $(CONF_TEST_OBJS) libcommon.la $(TEST_LDFLAGS) $(TEST_LIBS)
+
 parseln_test: $(PARSELN_TEST_OBJS) libcommon.la
 	$(LIBTOOL) --mode=link $(CC) -o $@ $(PARSELN_TEST_OBJS) libcommon.la $(TEST_LDFLAGS) $(TEST_LIBS)
 
@@ -107,21 +112,26 @@ uninstall:
 check: $(TEST_PROGS)
 	@if test X"$(cross_compiling)" != X"yes"; then \
 	    passed=0; failed=0; total=0; \
-	    dir=sudo_parseln; \
-	    mkdir -p regress/$$dir; \
-	    for t in $(srcdir)/regress/$$dir/*.in; do \
-		base=`basename $$t .in`; \
-		out="regress/$$dir/$$base.out"; \
-		./parseln_test <$$t >$$out; \
-		if cmp $$out $(srcdir)/$$out.ok >/dev/null; then \
-		    passed=`expr $$passed + 1`; \
-		    echo "$$dir/$$base: OK"; \
-		else \
-		    failed=`expr $$failed + 1`; \
-		    echo "$$dir/$$base: FAIL"; \
-		    diff $$out $(srcdir)/$$out.ok; \
-		fi; \
-		total=`expr $$total + 1`; \
+	    for dir in sudo_conf sudo_parseln; do \
+		mkdir -p regress/$$dir; \
+		for t in $(srcdir)/regress/$$dir/*.in; do \
+		    base=`basename $$t .in`; \
+		    out="regress/$$dir/$$base.out"; \
+		    if test "$$dir" = "sudo_conf"; then \
+			./conf_test $$t >$$out; \
+		    else \
+			./parseln_test <$$t >$$out; \
+		    fi; \
+		    if cmp $$out $(srcdir)/$$out.ok >/dev/null; then \
+			passed=`expr $$passed + 1`; \
+			echo "$$dir/$$base: OK"; \
+		    else \
+			failed=`expr $$failed + 1`; \
+			echo "$$dir/$$base: FAIL"; \
+			diff $$out $(srcdir)/$$out.ok; \
+		    fi; \
+		    total=`expr $$total + 1`; \
+		done; \
 	    done; \
 	    echo "$$dir: $$passed/$$total tests passed; $$failed/$$total tests failed"; \
 	    exit $$failed; \
@@ -171,6 +181,10 @@ lbuf.lo: $(srcdir)/lbuf.c $(top_builddir)/config.h $(incdir)/missing.h \
 list.lo: $(srcdir)/list.c $(top_builddir)/config.h $(incdir)/missing.h \
          $(incdir)/list.h $(incdir)/error.h
 	$(LIBTOOL) --mode=compile $(CC) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(DEFS) $(srcdir)/list.c
+conf_test.lo: $(srcdir)/regress/sudo_conf/conf_test.c \
+                 $(top_builddir)/config.h $(top_srcdir)/compat/stdbool.h \
+                 $(incdir)/missing.h $(incdir)/fileops.h
+	$(LIBTOOL) --mode=compile $(CC) -c -o $@ $(CPPFLAGS) $(CFLAGS) $(PIE_CFLAGS) $(SSP_CFLAGS) $(DEFS) $(srcdir)/regress/sudo_conf/conf_test.c
 parseln_test.lo: $(srcdir)/regress/sudo_parseln/parseln_test.c \
                  $(top_builddir)/config.h $(top_srcdir)/compat/stdbool.h \
                  $(incdir)/missing.h $(incdir)/fileops.h
diff --git a/common/regress/sudo_conf/conf_test.c b/common/regress/sudo_conf/conf_test.c
new file mode 100644
index 000000000..f73ada14e
--- /dev/null
+++ b/common/regress/sudo_conf/conf_test.c
@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2013 Todd C. Miller <Todd.Miller@courtesan.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <config.h>
+
+#include <sys/types.h>
+#include <stdio.h>
+#ifdef STDC_HEADERS
+# include <stdlib.h>
+# include <stddef.h>
+#else
+# ifdef HAVE_STDLIB_H
+#  include <stdlib.h>
+# endif
+#endif /* STDC_HEADERS */
+#ifdef HAVE_STRING_H
+# if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
+#  include <memory.h>
+# endif
+# include <string.h>
+#endif /* HAVE_STRING_H */
+#ifdef HAVE_STRINGS_H
+# include <strings.h>
+#endif /* HAVE_STRINGS_H */
+#ifdef HAVE_STDBOOL_H
+# include <stdbool.h>
+#else
+# include "compat/stdbool.h"
+#endif
+
+#include "missing.h"
+#include "sudo_conf.h"
+
+static void sudo_conf_dump(void);
+
+/*
+ * Simple test driver for sudo_conf().
+ * Parses the given configuration file and dumps the resulting
+ * sudo_conf_data struct to the standard output.
+ */
+int
+main(int argc, char *argv[])
+{
+    if (argc != 2) {
+	fprintf(stderr, "usage: conf_test conf_file\n");
+	exit(1);
+    }
+    sudo_conf_read(argv[1]);
+    sudo_conf_dump();
+
+    exit(0);
+}
+
+static void
+sudo_conf_dump(void)
+{
+    struct plugin_info_list *plugins = sudo_conf_plugins();
+    struct sudo_conf_paths *scp;
+    struct plugin_info *info;
+
+    printf("Set disable_coredump %s\n",
+	sudo_conf_disable_coredump() ? "true" : "false");
+    printf("Set group_source %s\n",
+	sudo_conf_group_source() == GROUP_SOURCE_ADAPTIVE ? "adaptive" :
+	sudo_conf_group_source() == GROUP_SOURCE_STATIC ? "static" : "dynamic");
+    printf("Set max_groups %d\n", sudo_conf_max_groups());
+    if (sudo_conf_debug_flags() != NULL)
+	printf("Debug %s %s\n", getprogname(), sudo_conf_debug_flags());
+    if (sudo_conf_askpass_path() != NULL)
+	printf("Path askpass %s\n", sudo_conf_askpass_path());
+#ifdef _PATH_SUDO_NOEXEC
+    if (sudo_conf_noexec_path() != NULL)
+	printf("Path noexec %s\n", sudo_conf_noexec_path());
+#endif
+    tq_foreach_fwd(plugins, info) {
+	printf("Plugin %s %s", info->symbol_name, info->path);
+	if (info->options) {
+	    char * const * op;
+	    for (op = info->options; *op != NULL; op++)
+		printf(" %s", *op);
+	}
+	putchar('\n');
+    }
+}
+
+/* STUB */
+void
+warning_set_locale(void)
+{
+    return;
+}
+
+/* STUB */
+void
+warning_restore_locale(void)
+{
+    return;
+}
diff --git a/common/regress/sudo_conf/test1.in b/common/regress/sudo_conf/test1.in
new file mode 100644
index 000000000..d572cad99
--- /dev/null
+++ b/common/regress/sudo_conf/test1.in
@@ -0,0 +1,72 @@
+#
+# Sample /etc/sudo.conf file
+#
+# Format:
+#   Plugin plugin_name plugin_path plugin_options ...
+#   Path askpass /path/to/askpass
+#   Path noexec /path/to/sudo_noexec.so
+#   Debug sudo /var/log/sudo_debug all@warn
+#   Set disable_coredump true
+#
+# Sudo plugins:
+#
+# The plugin_path is relative to ${prefix}/libexec unless fully qualified.
+# The plugin_name corresponds to a global symbol in the plugin
+#   that contains the plugin interface structure.
+# The plugin_options are optional.
+#
+# The sudoers plugin is used by default if no Plugin lines are present.
+Plugin sudoers_policy sudoers.so
+Plugin sudoers_io sudoers.so
+
+#
+# Sudo askpass:
+#
+# An askpass helper program may be specified to provide a graphical
+# password prompt for "sudo -A" support.  Sudo does not ship with its
+# own askpass program but can use the OpenSSH askpass.
+#
+# Use the OpenSSH askpass
+Path askpass /usr/X11R6/bin/ssh-askpass
+#
+# Use the Gnome OpenSSH askpass
+#Path askpass /usr/libexec/openssh/gnome-ssh-askpass
+
+#
+# Sudo noexec:
+#
+# Path to a shared library containing dummy versions of the execv(),
+# execve() and fexecve() library functions that just return an error.
+# This is used to implement the "noexec" functionality on systems that
+# support C<LD_PRELOAD> or its equivalent.
+# The compiled-in value is usually sufficient and should only be changed
+# if you rename or move the sudo_noexec.so file.
+#
+Path noexec /usr/libexec/sudo_noexec.so
+
+#
+# Core dumps:
+#
+# By default, sudo disables core dumps while it is executing (they
+# are re-enabled for the command that is run).
+# To aid in debugging sudo problems, you may wish to enable core
+# dumps by setting "disable_coredump" to false.
+#
+Set disable_coredump false
+
+#
+# User groups:
+#
+# Sudo passes the user's group list to the policy plugin.
+# If the user is a member of the maximum number of groups (usually 16),
+# sudo will query the group database directly to be sure to include
+# the full list of groups.
+#
+# On some systems, this can be expensive so the behavior is configurable.
+# The "group_source" setting has three possible values:
+#   static   - use the user's list of groups returned by the kernel.
+#   dynamic  - query the group database to find the list of groups.
+#   adaptive - if user is in less than the maximum number of groups.
+#	       use the kernel list, else query the group database.
+#
+Set group_source static
diff --git a/common/regress/sudo_conf/test1.out.ok b/common/regress/sudo_conf/test1.out.ok
new file mode 100644
index 000000000..54e067180
--- /dev/null
+++ b/common/regress/sudo_conf/test1.out.ok
@@ -0,0 +1,6 @@
+Set disable_coredump false
+Set group_source static
+Set max_groups -1
+Path askpass /usr/X11R6/bin/ssh-askpass
+Plugin sudoers_policy sudoers.so
+Plugin sudoers_io sudoers.so
diff --git a/common/regress/sudo_conf/test2.in b/common/regress/sudo_conf/test2.in
new file mode 100644
index 000000000..e69de29bb
diff --git a/common/regress/sudo_conf/test2.out.ok b/common/regress/sudo_conf/test2.out.ok
new file mode 100644
index 000000000..af42145e2
--- /dev/null
+++ b/common/regress/sudo_conf/test2.out.ok
@@ -0,0 +1,3 @@
+Set disable_coredump true
+Set group_source adaptive
+Set max_groups -1
diff --git a/common/regress/sudo_conf/test3.in b/common/regress/sudo_conf/test3.in
new file mode 100644
index 000000000..b111a235d
--- /dev/null
+++ b/common/regress/sudo_conf/test3.in
@@ -0,0 +1,2 @@
+Plugin sudoers_policy sudoers.so sudoers_file=/etc/sudoers sudoers_mode=0400 sudoers_gid=0 sudoers_uid=0
+Plugin sudoers_io sudoers.so
diff --git a/common/regress/sudo_conf/test3.out.ok b/common/regress/sudo_conf/test3.out.ok
new file mode 100644
index 000000000..819d638f8
--- /dev/null
+++ b/common/regress/sudo_conf/test3.out.ok
@@ -0,0 +1,5 @@
+Set disable_coredump true
+Set group_source adaptive
+Set max_groups -1
+Plugin sudoers_policy sudoers.so sudoers_file=/etc/sudoers sudoers_mode=0400 sudoers_gid=0 sudoers_uid=0
+Plugin sudoers_io sudoers.so
diff --git a/common/sudo_conf.c b/common/sudo_conf.c
index 8bd5853bf..772b51edb 100644
--- a/common/sudo_conf.c
+++ b/common/sudo_conf.c
@@ -75,7 +75,7 @@ extern bool atobool(const char *str); /* atobool.c */
 struct sudo_conf_table {
     const char *name;
     unsigned int namelen;
-    void (*setter)(const char *entry);
+    void (*setter)(const char *entry, const char *conf_file);
 };
 
 struct sudo_conf_paths {
@@ -84,15 +84,15 @@ struct sudo_conf_paths {
     const char *pval;
 };
 
-static void set_debug(const char *entry);
-static void set_path(const char *entry);
-static void set_plugin(const char *entry);
-static void set_variable(const char *entry);
-static void set_var_disable_coredump(const char *entry);
-static void set_var_group_source(const char *entry);
-static void set_var_max_groups(const char *entry);
+static void set_debug(const char *entry, const char *conf_file);
+static void set_path(const char *entry, const char *conf_file);
+static void set_plugin(const char *entry, const char *conf_file);
+static void set_variable(const char *entry, const char *conf_file);
+static void set_var_disable_coredump(const char *entry, const char *conf_file);
+static void set_var_group_source(const char *entry, const char *conf_file);
+static void set_var_max_groups(const char *entry, const char *conf_file);
 
-static unsigned int lineno;
+static unsigned int conf_lineno;
 
 static struct sudo_conf_table sudo_conf_table[] = {
     { "Debug", sizeof("Debug") - 1, set_debug },
@@ -136,7 +136,7 @@ static struct sudo_conf_data {
  * "Set variable_name value"
  */
 static void
-set_variable(const char *entry)
+set_variable(const char *entry, const char *conf_file)
 {
     struct sudo_conf_table *var;
 
@@ -146,20 +146,20 @@ set_variable(const char *entry)
 	    entry += var->namelen + 1;
 	    while (isblank((unsigned char)*entry))
 		entry++;
-	    var->setter(entry);
+	    var->setter(entry, conf_file);
 	    break;
 	}
     }
 }
 
 static void
-set_var_disable_coredump(const char *entry)
+set_var_disable_coredump(const char *entry, const char *conf_file)
 {
     sudo_conf_data.disable_coredump = atobool(entry);
 }
 
 static void
-set_var_group_source(const char *entry)
+set_var_group_source(const char *entry, const char *conf_file)
 {
     if (strcasecmp(entry, "adaptive") == 0) {
 	sudo_conf_data.group_source = GROUP_SOURCE_ADAPTIVE;
@@ -169,12 +169,12 @@ set_var_group_source(const char *entry)
 	sudo_conf_data.group_source = GROUP_SOURCE_DYNAMIC;
     } else {
 	warningx(_("unsupported group source `%s' in %s, line %d"), entry,
-	    _PATH_SUDO_CONF, lineno);
+	    conf_file, conf_lineno);
     }
 }
 
 static void
-set_var_max_groups(const char *entry)
+set_var_max_groups(const char *entry, const char *conf_file)
 {
     long lval;
     char *ep;
@@ -183,7 +183,7 @@ set_var_max_groups(const char *entry)
     if (*entry == '\0' || *ep != '\0' || lval < 0 || lval > INT_MAX ||
 	(errno == ERANGE && lval == LONG_MAX)) {
 	warningx(_("invalid max groups `%s' in %s, line %d"), entry,
-		    _PATH_SUDO_CONF, lineno);
+		    conf_file, conf_lineno);
     } else {
 	sudo_conf_data.max_groups = (int)lval;
     }
@@ -193,7 +193,7 @@ set_var_max_groups(const char *entry)
  * "Debug progname debug_file debug_flags"
  */
 static void
-set_debug(const char *entry)
+set_debug(const char *entry, const char *conf_file)
 {
     size_t filelen, proglen;
     const char *progname;
@@ -228,7 +228,7 @@ set_debug(const char *entry)
 }
 
 static void
-set_path(const char *entry)
+set_path(const char *entry, const char *conf_file)
 {
     const char *name, *path;
     struct sudo_conf_paths *cur;
@@ -252,7 +252,7 @@ set_path(const char *entry)
 }
 
 static void
-set_plugin(const char *entry)
+set_plugin(const char *entry, const char *conf_file)
 {
     struct plugin_info *info;
     const char *name, *path, *cp, *ep;
@@ -299,7 +299,7 @@ set_plugin(const char *entry)
     info->options = options;
     info->prev = info;
     /* info->next = NULL; */
-    info->lineno = lineno;
+    info->lineno = conf_lineno;
     tq_append(&sudo_conf_data.plugins, info);
 }
 
@@ -351,7 +351,7 @@ sudo_conf_disable_coredump(void)
  * Reads in /etc/sudo.conf and populates sudo_conf_data.
  */
 void
-sudo_conf_read(void)
+sudo_conf_read(const char *conf_file)
 {
     struct sudo_conf_table *cur;
     struct stat sb;
@@ -364,40 +364,43 @@ sudo_conf_read(void)
     if (prev_locale[0] != 'C' || prev_locale[1] != '\0')
         setlocale(LC_ALL, "C");
 
-    switch (sudo_secure_file(_PATH_SUDO_CONF, ROOT_UID, -1, &sb)) {
-	case SUDO_PATH_SECURE:
-	    break;
-	case SUDO_PATH_MISSING:
-	    /* Root should always be able to read sudo.conf. */
-	    if (errno != ENOENT && geteuid() == ROOT_UID)
-		warning(_("unable to stat %s"), _PATH_SUDO_CONF);
-	    goto done;
-	case SUDO_PATH_BAD_TYPE:
-	    warningx(_("%s is not a regular file"), _PATH_SUDO_CONF);
-	    goto done;
-	case SUDO_PATH_WRONG_OWNER:
-	    warningx(_("%s is owned by uid %u, should be %u"),
-		_PATH_SUDO_CONF, (unsigned int) sb.st_uid, ROOT_UID);
-	    goto done;
-	case SUDO_PATH_WORLD_WRITABLE:
-	    warningx(_("%s is world writable"), _PATH_SUDO_CONF);
-	    goto done;
-	case SUDO_PATH_GROUP_WRITABLE:
-	    warningx(_("%s is group writable"), _PATH_SUDO_CONF);
-	    goto done;
-	default:
-	    /* NOTREACHED */
-	    goto done;
+    if (conf_file == NULL) {
+	conf_file = _PATH_SUDO_CONF;
+	switch (sudo_secure_file(conf_file, ROOT_UID, -1, &sb)) {
+	    case SUDO_PATH_SECURE:
+		break;
+	    case SUDO_PATH_MISSING:
+		/* Root should always be able to read sudo.conf. */
+		if (errno != ENOENT && geteuid() == ROOT_UID)
+		    warning(_("unable to stat %s"), conf_file);
+		goto done;
+	    case SUDO_PATH_BAD_TYPE:
+		warningx(_("%s is not a regular file"), conf_file);
+		goto done;
+	    case SUDO_PATH_WRONG_OWNER:
+		warningx(_("%s is owned by uid %u, should be %u"),
+		    conf_file, (unsigned int) sb.st_uid, ROOT_UID);
+		goto done;
+	    case SUDO_PATH_WORLD_WRITABLE:
+		warningx(_("%s is world writable"), conf_file);
+		goto done;
+	    case SUDO_PATH_GROUP_WRITABLE:
+		warningx(_("%s is group writable"), conf_file);
+		goto done;
+	    default:
+		/* NOTREACHED */
+		goto done;
+	}
     }
 
-    if ((fp = fopen(_PATH_SUDO_CONF, "r")) == NULL) {
+    if ((fp = fopen(conf_file, "r")) == NULL) {
 	if (errno != ENOENT && geteuid() == ROOT_UID)
-	    warning(_("unable to open %s"), _PATH_SUDO_CONF);
+	    warning(_("unable to open %s"), conf_file);
 	goto done;
     }
 
-    lineno = 0;
-    while (sudo_parseln(&line, &linesize, &lineno, fp) != -1) {
+    conf_lineno = 0;
+    while (sudo_parseln(&line, &linesize, &conf_lineno, fp) != -1) {
 	if (*(cp = line) == '\0')
 	    continue;		/* empty line or comment */
 
@@ -407,7 +410,7 @@ sudo_conf_read(void)
 		cp += cur->namelen;
 		while (isblank((unsigned char)*cp))
 		    cp++;
-		cur->setter(cp);
+		cur->setter(cp, conf_file);
 		break;
 	    }
 	}
diff --git a/include/sudo_conf.h b/include/sudo_conf.h
index a855e2091..778a4b3c4 100644
--- a/include/sudo_conf.h
+++ b/include/sudo_conf.h
@@ -34,7 +34,7 @@ struct plugin_info {
 TQ_DECLARE(plugin_info)
 
 /* Read main sudo.conf file. */
-void sudo_conf_read(void);
+void sudo_conf_read(const char *);
 
 /* Accessor functions. */
 const char *sudo_conf_askpass_path(void);
diff --git a/plugins/sudoers/sudoreplay.c b/plugins/sudoers/sudoreplay.c
index 2ed553856..b911cb1fe 100644
--- a/plugins/sudoers/sudoreplay.c
+++ b/plugins/sudoers/sudoreplay.c
@@ -271,7 +271,7 @@ main(int argc, char *argv[])
     error_callback_register(sudoreplay_cleanup);
 
     /* Read sudo.conf. */
-    sudo_conf_read();
+    sudo_conf_read(NULL);
 
     while ((ch = getopt(argc, argv, "d:f:hlm:s:V")) != -1) {
 	switch(ch) {
diff --git a/plugins/sudoers/testsudoers.c b/plugins/sudoers/testsudoers.c
index 8ac9130d1..cd1fd0b1b 100644
--- a/plugins/sudoers/testsudoers.c
+++ b/plugins/sudoers/testsudoers.c
@@ -147,7 +147,7 @@ main(int argc, char *argv[])
     textdomain("sudoers");
 
     /* Read sudo.conf. */
-    sudo_conf_read();
+    sudo_conf_read(NULL);
 
     dflag = 0;
     grfile = pwfile = NULL;
diff --git a/plugins/sudoers/visudo.c b/plugins/sudoers/visudo.c
index 2225aff0c..1e33d1781 100644
--- a/plugins/sudoers/visudo.c
+++ b/plugins/sudoers/visudo.c
@@ -166,7 +166,7 @@ main(int argc, char *argv[])
     error_callback_register(visudo_cleanup);
 
     /* Read sudo.conf. */
-    sudo_conf_read();
+    sudo_conf_read(NULL);
 
     /*
      * Arg handling.
diff --git a/src/sesh.c b/src/sesh.c
index 9b376287f..c676f0fae 100644
--- a/src/sesh.c
+++ b/src/sesh.c
@@ -57,7 +57,7 @@ main(int argc, char *argv[], char *envp[])
 	errorx(EXIT_FAILURE, _("requires at least one argument"));
 
     /* Read sudo.conf. */
-    sudo_conf_read();
+    sudo_conf_read(NULL);
 
     /* If argv[0] ends in -noexec, pass the flag to sudo_execve() */
     if ((cp = strrchr(argv[0], '-')) != NULL && cp != argv[0])
diff --git a/src/sudo.c b/src/sudo.c
index 8b843b64c..d9088a444 100644
--- a/src/sudo.c
+++ b/src/sudo.c
@@ -178,7 +178,7 @@ main(int argc, char *argv[], char *envp[])
     fix_fds();
 
     /* Read sudo.conf. */
-    sudo_conf_read();
+    sudo_conf_read(NULL);
 
     /* Fill in user_info with user name, uid, cwd, etc. */
     memset(&user_details, 0, sizeof(user_details));