diff --git a/datapool/PoolDataSetBase.h b/datapool/PoolDataSetBase.h
index 65a6651e..75654146 100644
--- a/datapool/PoolDataSetBase.h
+++ b/datapool/PoolDataSetBase.h
@@ -162,7 +162,7 @@ protected:
 
 private:
 	bool protectEveryReadCommitCall = false;
-	MutexIF::TimeoutType timeoutTypeForSingleVars;
+	MutexIF::TimeoutType timeoutTypeForSingleVars = MutexIF::TimeoutType::WAITING;
 	uint32_t mutexTimeoutForSingleVars = 20;
 
 	ReturnValue_t readVariable(uint16_t count);