diff --git a/src/mm-modem-helpers-qmi.c b/src/mm-modem-helpers-qmi.c
index e48d2eb7..e5e3243c 100644
--- a/src/mm-modem-helpers-qmi.c
+++ b/src/mm-modem-helpers-qmi.c
@@ -14,6 +14,8 @@
  * Copyright (C) 2018 Aleksander Morgado <aleksander@aleksander.es>
  */
 
+#include <string.h>
+
 #include <ModemManager.h>
 #include <mm-errors-types.h>