diff --git a/cli/mmcli-output.c b/cli/mmcli-output.c
index 245aeed1..ac7dc333 100644
--- a/cli/mmcli-output.c
+++ b/cli/mmcli-output.c
@@ -19,6 +19,7 @@
  */
 
 #include <stdio.h>
+#include <string.h>
 
 #include <libmm-glib.h>
 #include "mm-common-helpers.h"