Cannot overide incomingConnection in QLocalServer

When trying to overide incomingConnection in QLocalServer got this error:

error: ‘void LocalServerHijacked::incomingConnection(qintptr)’ marked override, but does not override
void incomingConnection(qintptr socketDescriptor) override;

QTcpServer works completely fine though. 

My qlocalserver.h did say 

protected:
virtual void incomingConnection(quintptr socketDescriptor);

But