diff --git a/gtk/add-dialog.c b/gtk/add-dialog.c
index f007f5e04..f07121829 100644
--- a/gtk/add-dialog.c
+++ b/gtk/add-dialog.c
@@ -13,6 +13,8 @@
 #include <glib/gi18n.h>
 #include <gtk/gtk.h>
 
+#include <string.h>
+
 #include "add-dialog.h"
 #include "conf.h"
 #include "file-list.h"