diff --git a/winixd/core/basethread.h b/winixd/core/basethread.h
index b5c26ee..2813a93 100644
--- a/winixd/core/basethread.h
+++ b/winixd/core/basethread.h
@@ -144,12 +144,12 @@ protected:
 
 	void SignalLoop();
 	static void * StartRoutine(void *);
-	bool BaseInit();
-	void BaseUninit();
-	bool BaseSignalReceived();
-	void BaseDo();
-	bool WaitForSignal();
-	bool WaitForSignalSleep(time_t second);
+	virtual bool BaseInit();
+	virtual void BaseUninit();
+	virtual bool BaseSignalReceived();
+	virtual void BaseDo();
+	virtual bool WaitForSignal();
+	virtual bool WaitForSignalSleep(time_t second);
 
 	bool Lock();
 	void Unlock();