diff --git a/src/xmpp/avatar.c b/src/xmpp/avatar.c
index 8ecc86fa..e6dd435f 100644
--- a/src/xmpp/avatar.c
+++ b/src/xmpp/avatar.c
@@ -34,6 +34,7 @@
  */
 
 #include <glib.h>
+#include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>