diff --git a/src_main/concurrent/piconditionvar.h b/src_main/concurrent/piconditionvar.h
index cef1f9f4..a506b8c6 100644
--- a/src_main/concurrent/piconditionvar.h
+++ b/src_main/concurrent/piconditionvar.h
@@ -32,7 +32,7 @@ public:
 	/**
 	 * @brief see wait(PIConditionLock&, const std::function<bool()>&)
 	 */
-	void wait(PIConditionLock& lk);
+	virtual void wait(PIConditionLock& lk);
 
 	/**
 	 * @brief Wait until notified
@@ -58,12 +58,12 @@ public:
 	 * @param condition A callable object or function that takes no arguments and returns a value that can be evaluated
 	 * as a bool. This is called repeatedly until it evaluates to true.
 	 */
-	void wait(PIConditionLock& lk, const std::function<bool()>& condition);
+	virtual void wait(PIConditionLock& lk, const std::function<bool()>& condition);
 
 	/**
 	 * @brief see waitFor(PIConditionLock&, int, const std::function<bool()>&)
 	 */
-	bool waitFor(PIConditionLock& lk, int timeoutMs);
+	virtual bool waitFor(PIConditionLock& lk, int timeoutMs);
 
 	/**
 	 * @brief Wait for timeout or until notified
@@ -90,7 +90,7 @@ public:
 	 * as a bool. This is called repeatedly until it evaluates to true.
 	 * @return false if timeout reached or true if wakeup condition is true
 	 */
-	bool waitFor(PIConditionLock& lk, int timeoutMs, const std::function<bool()>& condition);
+	virtual bool waitFor(PIConditionLock& lk, int timeoutMs, const std::function<bool()>& condition);
 
 private:
 	NO_COPY_CLASS(PIConditionVariable)