diff --git a/mbuni/mmlib/mms_cfg.c b/mbuni/mmlib/mms_cfg.c
index 8b6c6ca..4688ccd 100644
--- a/mbuni/mmlib/mms_cfg.c
+++ b/mbuni/mmlib/mms_cfg.c
@@ -13,6 +13,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <errno.h>
 
 #include "mms_cfg.h"