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