diff --git a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.h b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.h
index 26b3e21..3a2e9fa 100644
--- a/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.h
+++ b/Trenser.VehicleServiceSystem/Trenser.VehicleServiceSystem/datastores/DataStore.h
@@ -30,7 +30,6 @@ private:
     DataStore& operator=(const DataStore&) = delete;
     DataStore(DataStore&&) = delete;
     DataStore& operator=(DataStore&&) = delete;
-    bool unlockMutex();
     HANDLE m_globalMutex;
     MappingInfo m_users;
     MappingInfo m_notifications;