diff --git a/testsuite/gtk/defaultvalue.c b/testsuite/gtk/defaultvalue.c
index 0cc445f0cc..05f176f950 100644
--- a/testsuite/gtk/defaultvalue.c
+++ b/testsuite/gtk/defaultvalue.c
@@ -104,7 +104,7 @@ test_type (gconstpointer data)
   klass = g_type_class_ref (type);
 
   if (g_type_is_a (type, GTK_TYPE_SETTINGS))
-    instance = g_object_ref (gtk_settings_get_default ());
+    instance = G_OBJECT (g_object_ref (gtk_settings_get_default ()));
   else if (g_type_is_a (type, GDK_TYPE_WINDOW))
     {
       GdkWindowAttr attributes;
@@ -113,7 +113,7 @@ test_type (gconstpointer data)
       attributes.event_mask = 0;
       attributes.width = 100;
       attributes.height = 100;
-      instance = g_object_ref (gdk_window_new (NULL, &attributes, 0));
+      instance = G_OBJECT (g_object_ref (gdk_window_new (NULL, &attributes, 0)));
     }
   else if (g_str_equal (g_type_name (type), "GdkX11Cursor"))
     instance = g_object_new (type, "display", display, NULL);