diff --git a/plugins/xmm/mm-modem-helpers-xmm.c b/plugins/xmm/mm-modem-helpers-xmm.c
index a8ede4cf..1c2280af 100644
--- a/plugins/xmm/mm-modem-helpers-xmm.c
+++ b/plugins/xmm/mm-modem-helpers-xmm.c
@@ -13,6 +13,8 @@
  * Copyright (C) 2018 Aleksander Morgado <aleksander@aleksander.es>
  */
 
+#include <string.h>
+
 #include "mm-log.h"
 #include "mm-modem-helpers.h"
 #include "mm-modem-helpers-xmm.h"