diff --git a/tests/mock/mock_class.c b/tests/mock/mock_class.c
index a387326..ef989bc 100644
--- a/tests/mock/mock_class.c
+++ b/tests/mock/mock_class.c
@@ -67,6 +67,6 @@ mockClone(void * _this, void * _base)
 }
 
 TR_INIT_IFACE(TR_Class, mockCtor, mockDtor, mockClone);
-TR_CREATE_CLASS(MockClass, NULL, TR_IF(TR_Class));
+TR_CREATE_CLASS(MockClass, NULL, NULL, TR_IF(TR_Class));
 
 // vim: set et ts=4 sw=4:
diff --git a/tests/mock/mock_class.h b/tests/mock/mock_class.h
index 5e12be2..8af7c39 100644
--- a/tests/mock/mock_class.h
+++ b/tests/mock/mock_class.h
@@ -36,6 +36,7 @@ void _reset();
 TR_CLASS(MockClass) {
     int value;
 };
+TR_CLASSVARS_DECL(MockClass) {};
 
 /**
  * ~~~ method declarations ~~~~~~~~