Qt connect is complaining that it can't find slot in super class when connecting sub class

Got an runtime error in the Qt application we are building, were connecting a signal with a slot, but when running the app we got this error message in the console:
Object::connect: No such slot mgccis::web::SuperClassWebservice::onReadyRead() in ServiceInterface\SubClassWebservice.cpp:37

The connect code in the SubClassWebservice looked like this:

connect(httpPost_parameterData_.data(), SIGNAL(readyRead()), this, SLOT(onReadyRead()));

There was a slot in the subClassWebservice, took a google search session to find out the real problem, found this on Stackoverflow:
http://stackoverflow.com/questions/4322224/qt-slots-and-inheritance-why-is-my-program-trying-to-connect-to-the-parent-inst

I've forgot to add the Q_OBJECT in the class declaration of the sub class.