diff --git a/src/config.in b/src/config.in
index 8d797b515cb..773fb0301c5 100644
--- a/src/config.in
+++ b/src/config.in
@@ -303,6 +303,7 @@ Boston, MA 02111-1307, USA.  */
 #undef HAVE_RINDEX
 #undef HAVE_MMAP
 #undef HAVE_GAI_STRERROR
+#undef HAVE_MKSTEMP
 
 #undef LOCALTIME_CACHE
 #undef HAVE_INET_SOCKETS