diff --git a/daemon/dd.c b/daemon/dd.c
index 2402e13e3..0a53b3160 100644
--- a/daemon/dd.c
+++ b/daemon/dd.c
@@ -20,6 +20,7 @@
 
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 
 #include "../src/guestfs_protocol.h"
 #include "daemon.h"