DeviceExtension = DeviceObject->DeviceExtension;
DeviceExtension->ReferenceCount = 0;
DeviceExtension->TimerActive = FALSE;
- IoInitializeDpcRequest(DeviceObject, BeepDPC);
+ IoInitializeDpcRequest(DeviceObject, (PIO_DPC_ROUTINE)BeepDPC);
KeInitializeTimer(&DeviceExtension->Timer);
ExInitializeFastMutex(&DeviceExtension->Mutex);