diff --git a/gio/tests/gdbus-test-codegen.c b/gio/tests/gdbus-test-codegen.c
index c54c7aceb..c974d2058 100644
--- a/gio/tests/gdbus-test-codegen.c
+++ b/gio/tests/gdbus-test-codegen.c
@@ -897,6 +897,11 @@ check_bar_proxy (FooiGenBar *proxy,
   g_assert_no_error (error);
   g_assert (ret);
 
+  g_clear_pointer (&ret_val_string, g_free);
+  g_clear_pointer (&ret_val_objpath, g_free);
+  g_clear_pointer (&ret_val_signature, g_free);
+  g_clear_pointer (&ret_val_bytestring, g_free);
+
   error = NULL;
   array_of_signatures = g_variant_ref_sink (g_variant_new_parsed ("[@g 'ass', 'git']"));
   ret = foo_igen_bar_call_test_non_primitive_types_sync (proxy,