diff --git a/config.h.in b/config.h.in
index 1a89e85..2df4786 100644
--- a/config.h.in
+++ b/config.h.in
@@ -801,6 +801,14 @@
 #undef HAVE_SETREGID
 #undef HAVE_DECL_SETREGID
 
+/* Define if you have the setregid function.  */
+#undef HAVE_SETRESGID
+#undef HAVE_DECL_SETRESGID
+
+/* Define if you have the setresuid function.  */
+#undef HAVE_SETRESUID
+#undef HAVE_DECL_SETRESUID
+
 /* Define if you have the setvbuf function.  */
 #undef HAVE_SETVBUF
 
diff --git a/configure.ac b/configure.ac
index a3f6d8f..e5162c4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -799,6 +799,7 @@ AC_CHECK_DECLS([confstr])
 AC_CHECK_DECLS([printf])
 AC_CHECK_DECLS([sbrk])
 AC_CHECK_DECLS([setregid])
+AC_CHECK_DECLS[(setresuid, setresgid])
 AC_CHECK_DECLS([strcpy])
 AC_CHECK_DECLS([strsignal])
 
diff --git a/shell.c b/shell.c
index 4aae182..484d8a9 100644
--- a/shell.c
+++ b/shell.c
@@ -1286,7 +1286,11 @@ disable_priv_mode ()
 {
   int e;
 
+#if HAVE_DECL_SETRESUID
+  if (setresuid (current_user.uid, current_user.uid, current_user.uid) < 0)
+#else
   if (setuid (current_user.uid) < 0)
+#endif
     {
       e = errno;
       sys_error (_("cannot set uid to %d: effective uid %d"), current_user.uid, current_user.euid);
@@ -1295,7 +1299,11 @@ disable_priv_mode ()
 	exit (e);
 #endif
     }
+#if HAVE_DECL_SETRESGID
+  if (setresgid (current_user.gid, current_user.gid, current_user.gid) < 0)
+#else
   if (setgid (current_user.gid) < 0)
+#endif
     sys_error (_("cannot set gid to %d: effective gid %d"), current_user.gid, current_user.egid);
 
   current_user.euid = current_user.uid;
-- 
2.25.4