diff --git a/src/PythonQtSignalReceiver.cpp b/src/PythonQtSignalReceiver.cpp
index 0217c73..b10086a 100644
--- a/src/PythonQtSignalReceiver.cpp
+++ b/src/PythonQtSignalReceiver.cpp
@@ -132,6 +132,11 @@ PyObject* PythonQtSignalTarget::call(PyObject* callable, const PythonQtMethodInf
   return result;
 }
 
+bool PythonQtSignalTarget::isSame( int signalId, PyObject* callable ) const
+{
+  return PyObject_Compare(callable, _callable) == 0 && signalId==_signalId;
+}
+
 //------------------------------------------------------------------------------
 
 PythonQtSignalReceiver::PythonQtSignalReceiver(QObject* obj):PythonQtSignalReceiverBase(obj)
diff --git a/src/PythonQtSignalReceiver.h b/src/PythonQtSignalReceiver.h
index 210f8d6..49ac0dc 100644
--- a/src/PythonQtSignalReceiver.h
+++ b/src/PythonQtSignalReceiver.h
@@ -84,7 +84,7 @@ public:
   void call(void **arguments) const;
 
   //! check if it is the same signal target
-  bool isSame(int signalId, PyObject* callable) const { return callable==_callable && signalId==_signalId; }
+  bool isSame(int signalId, PyObject* callable) const;
 
   //! call the given callable with arguments described by PythonQtMethodInfo, returns a new reference as result value (or NULL)
   static PyObject* call(PyObject* callable, const PythonQtMethodInfo* methodInfo, void **arguments, bool skipFirstArgumentOfMethodInfo = false);