diff --git a/Core/Code/CppMicroServices/src/service/usServiceInterface.h b/Core/Code/CppMicroServices/src/service/usServiceInterface.h
index 535bba1ba3..de734d2b95 100644
--- a/Core/Code/CppMicroServices/src/service/usServiceInterface.h
+++ b/Core/Code/CppMicroServices/src/service/usServiceInterface.h
@@ -1,53 +1,55 @@
 /*=============================================================================
 
   Library: CppMicroServices
 
   Copyright (c) German Cancer Research Center,
     Division of Medical and Biological Informatics
 
   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
     http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
 
 =============================================================================*/
 
 
 #ifndef USSERVICEINTERFACE_H
 #define USSERVICEINTERFACE_H
 
+#include <usConfig.h>
+
 template<class T> inline const char* us_service_interface_iid()
 { return 0; }
 
 #if defined(QT_DEBUG) || defined(QT_NODEBUG)
 #include <qobject.h>
 
 #define US_DECLARE_SERVICE_INTERFACE(IFace, IId)                                 \
   template<> inline const char* qobject_interface_iid<IFace *>()                 \
   { return IId; }                                                                \
   template<> inline const char* us_service_interface_iid<IFace *>()              \
   { return IId; }                                                                \
   template<> inline IFace *qobject_cast<IFace *>(QObject *object)                \
-  { return reinterpret_cast<IFace *>((object ? object->qt_metacast(IId) : 0)); } \
+  { return dynamic_cast<IFace*>(reinterpret_cast<US_BASECLASS_NAME *>((object ? object->qt_metacast(IId) : 0))); } \
   template<> inline IFace *qobject_cast<IFace *>(const QObject *object)          \
-  { return reinterpret_cast<IFace *>((object ? const_cast<QObject *>(object)->qt_metacast(IId) : 0)); }
+  { return dynamic_cast<IFace*>(reinterpret_cast<US_BASECLASS_NAME *>((object ? const_cast<QObject *>(object)->qt_metacast(IId) : 0))); }
 
 #else
 
 #define US_DECLARE_SERVICE_INTERFACE(IFace, IId)                                 \
   template<> inline const char* us_service_interface_iid<IFace *>()              \
   { return IId; }                                                                \
 
 #endif
 
 template<class T> inline const char* us_service_impl_name(T* /*impl*/)
 { return "(unknown implementation)"; }
 
 #endif // USSERVICEINTERFACE_H