diff --git a/libmm-glib/tests/test-common-helpers.c b/libmm-glib/tests/test-common-helpers.c
index 9a5701d1..19e1122a 100644
--- a/libmm-glib/tests/test-common-helpers.c
+++ b/libmm-glib/tests/test-common-helpers.c
@@ -13,6 +13,7 @@
  * Copyright (C) 2012 Google, Inc.
  */
 
+#include <string.h>
 #include <glib-object.h>
 
 #include <libmm-glib.h>