diff --git a/mp_msg.c b/mp_msg.c
index 5ab75f062c..c3c38a674b 100644
--- a/mp_msg.c
+++ b/mp_msg.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>
+#include <string.h>
 
 #include "config.h"