diff --git a/config.h.in b/config.h.in
index d50bbeecb..4b89d48a0 100644
--- a/config.h.in
+++ b/config.h.in
@@ -421,9 +421,6 @@
 /* Define to 1 if you have the `setrlimit64' function. */
 #undef HAVE_SETRLIMIT64
 
-/* Define to 1 if you have the `setsid' function. */
-#undef HAVE_SETSID
-
 /* Define to 1 if you have the `set_auth_parameters' function. */
 #undef HAVE_SET_AUTH_PARAMETERS
 
diff --git a/configure b/configure
index 5f57f4c57..11b69b818 100755
--- a/configure
+++ b/configure
@@ -14571,7 +14571,7 @@ LIBS=$ac_save_LIBS
 
 for ac_func in strchr strrchr memchr memcpy memset sysconf tzset \
 	       strftime setrlimit initgroups fstat gettimeofday \
-	       regcomp setlocale getaddrinfo setsid setenv vhangup \
+	       regcomp setlocale getaddrinfo setenv vhangup \
 	       mbr_check_membership setrlimit64
 do :
   as_ac_var=`$as_echo "ac_cv_func_$ac_func" | $as_tr_sh`
diff --git a/configure.in b/configure.in
index 4e0a145dd..e02e474b9 100644
--- a/configure.in
+++ b/configure.in
@@ -1914,7 +1914,7 @@ dnl
 AC_FUNC_GETGROUPS
 AC_CHECK_FUNCS(strchr strrchr memchr memcpy memset sysconf tzset \
 	       strftime setrlimit initgroups fstat gettimeofday \
-	       regcomp setlocale getaddrinfo setsid setenv vhangup \
+	       regcomp setlocale getaddrinfo setenv vhangup \
 	       mbr_check_membership setrlimit64)
 AC_CHECK_FUNCS(getline, [], [
     AC_LIBOBJ(getline)
diff --git a/plugins/sudoers/logging.c b/plugins/sudoers/logging.c
index 31e8287a7..16fe270a0 100644
--- a/plugins/sudoers/logging.c
+++ b/plugins/sudoers/logging.c
@@ -451,18 +451,8 @@ send_mail(const char *fmt, ...)
     }
 
     /* Daemonize - disassociate from session/tty. */
-#ifdef HAVE_SETSID
     if (setsid() == -1)
       warning("setsid");
-#else
-    setpgrp(0, 0);
-# ifdef TIOCNOTTY
-    if ((fd = open(_PATH_TTY, O_RDWR, 0644)) != -1) {
-	ioctl(fd, TIOCNOTTY, NULL);
-	close(fd);
-    }
-# endif
-#endif
     (void) chdir("/");
     if ((fd = open(_PATH_DEVNULL, O_RDWR, 0644)) != -1) {
 	(void) dup2(fd, STDIN_FILENO);
diff --git a/src/exec_pty.c b/src/exec_pty.c
index d42109cc2..71d0a00b4 100644
--- a/src/exec_pty.c
+++ b/src/exec_pty.c
@@ -835,23 +835,10 @@ exec_monitor(struct command_details *details, char *argv[], char *envp[],
      * and the slave pty as the controlling terminal.
      * This allows us to be notified when the child has been suspended.
      */
-#ifdef HAVE_SETSID
     if (setsid() == -1) {
 	warning("setsid");
 	goto bad;
     }
-#else
-# ifdef TIOCNOTTY
-    n = open(_PATH_TTY, O_RDWR|O_NOCTTY);
-    if (n >= 0) {
-	/* Disconnect from old controlling tty. */
-	if (ioctl(n, TIOCNOTTY, NULL) == -1)
-	    warning("cannot disconnect controlling tty");
-	close(n);
-    }
-# endif
-    setpgrp(0, 0);
-#endif
     if (io_fds[SFD_SLAVE] != -1) {
 #ifdef TIOCSCTTY
 	if (ioctl(io_fds[SFD_SLAVE], TIOCSCTTY, NULL) != 0)