diff --git a/configure b/configure
index 7ea34399a..2467429c8 100755
--- a/configure
+++ b/configure
@@ -22930,7 +22930,8 @@ if test "x$ac_cv_func_getprogname" = xyes; then :
   cat >>confdefs.h <<_ACEOF
 #define HAVE_GETPROGNAME 1
 _ACEOF
- for ac_func in setprogname
+
+    for ac_func in setprogname
 do :
   ac_fn_c_check_func "$LINENO" "setprogname" "ac_cv_func_setprogname"
 if test "x$ac_cv_func_setprogname" = xyes; then :
@@ -22938,9 +22939,17 @@ if test "x$ac_cv_func_setprogname" = xyes; then :
 #define HAVE_SETPROGNAME 1
 _ACEOF
 
+else
+
+    for _sym in sudo_setprogname; do
+	COMPAT_EXP="${COMPAT_EXP}${_sym}
+"
+    done
+
 fi
 done
 
+
 else
 
     { $as_echo "$as_me:${as_lineno-$LINENO}: checking for __progname" >&5
@@ -22982,6 +22991,12 @@ $as_echo "$sudo_cv___progname" >&6; }
     done
 
 
+    for _sym in sudo_setprogname; do
+	COMPAT_EXP="${COMPAT_EXP}${_sym}
+"
+    done
+
+
 fi
 done
 
diff --git a/configure.ac b/configure.ac
index 7c1503fdd..4221dbec8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3309,9 +3309,11 @@ esac
 LIBS="$OLIBS"
 
 dnl
-dnl Check for getprogname() or __progname
+dnl Check for getprogname()/setprogname() or __progname
 dnl
-AC_CHECK_FUNCS([getprogname], [AC_CHECK_FUNCS([setprogname])], [
+AC_CHECK_FUNCS([getprogname], [
+    AC_CHECK_FUNCS([setprogname], [], [SUDO_APPEND_COMPAT_EXP(sudo_setprogname)])
+], [
     AC_MSG_CHECKING([for __progname])
     AC_CACHE_VAL(sudo_cv___progname, [
     AC_LINK_IFELSE([AC_LANG_PROGRAM([[]], [[extern char *__progname; if (__progname[0] == '\0') return 1;]])], [sudo_cv___progname=yes], [sudo_cv___progname=no])])
@@ -3320,6 +3322,7 @@ AC_CHECK_FUNCS([getprogname], [AC_CHECK_FUNCS([setprogname])], [
     fi
     AC_MSG_RESULT($sudo_cv___progname)
     SUDO_APPEND_COMPAT_EXP(sudo_getprogname)
+    SUDO_APPEND_COMPAT_EXP(sudo_setprogname)
 ])
 dnl
 dnl Check for __func__ or __FUNCTION__
diff --git a/include/sudo_compat.h b/include/sudo_compat.h
index 095dd04d0..15aeeca70 100644
--- a/include/sudo_compat.h
+++ b/include/sudo_compat.h
@@ -575,6 +575,11 @@ sudo_dso_public const char *sudo_getprogname(void);
 # undef getprogname
 # define getprogname() sudo_getprogname()
 #endif /* HAVE_GETPROGNAME */
+#ifndef HAVE_SETPROGNAME
+sudo_dso_public void sudo_setprogname(const char *name);
+# undef setprogname
+# define setprogname(_a) sudo_setprogname(_a)
+#endif /* HAVE_SETPROGNAME */
 #ifndef HAVE_REALLOCARRAY
 sudo_dso_public void *sudo_reallocarray(void *ptr, size_t nmemb, size_t size);
 # undef reallocarray
diff --git a/lib/util/progname.c b/lib/util/progname.c
index d1bf15d15..57a8c03af 100644
--- a/lib/util/progname.c
+++ b/lib/util/progname.c
@@ -31,10 +31,21 @@
 
 #ifdef HAVE_GETPROGNAME
 
+# ifndef HAVE_SETPROGNAME
+/* Assume __progname if have getprogname(3) but not setprogname(3). */
+extern const char *__progname;
+
+void
+sudo_setprogname(const char *name)
+{
+    const char *base = strrchr(name, '/');
+    __progname = base ? base : name;
+}
+# endif
+
 void
 initprogname2(const char *name, const char * const * allowed)
 {
-# ifdef HAVE_SETPROGNAME
     const char *progname;
     int i;
 
@@ -61,7 +72,6 @@ initprogname2(const char *name, const char * const * allowed)
     /* Update internal progname if needed. */
     if (name != progname)
 	setprogname(name);
-# endif
     return;
 }
 
@@ -109,6 +119,13 @@ sudo_getprogname(void)
 {
     return progname;
 }
+
+void
+sudo_setprogname(const char *name)
+{
+    const char *base = strrchr(name, '/');
+    progname = base ? base : name;
+}
 #endif /* !HAVE_GETPROGNAME */
 
 void