diff --git a/gtk/gtkimagedefinition.c b/gtk/gtkimagedefinition.c
index 351dbe4b02..6ef67562e2 100644
--- a/gtk/gtkimagedefinition.c
+++ b/gtk/gtkimagedefinition.c
@@ -254,8 +254,8 @@ gtk_image_definition_unref (GtkImageDefinition *def)
   switch (def->type)
     {
     default:
-      g_assert_not_reached ();
     case GTK_IMAGE_EMPTY:
+      g_assert_not_reached ();
       break;
     case GTK_IMAGE_PIXBUF:
       g_object_unref (def->pixbuf.pixbuf);