diff --git a/gtk/dialogs.c b/gtk/dialogs.c
index 48764b245..1573ce39a 100644
--- a/gtk/dialogs.c
+++ b/gtk/dialogs.c
@@ -331,6 +331,7 @@ static void
 freedata(gpointer gdata, GClosure *closure SHUTUP) {
   struct prefdata *data = gdata;
 
+  g_list_free(data->prefwidgets);
   g_object_unref(G_OBJECT(data->back));
   g_free(data);
 }