diff --git a/UpdatePTUDevCtrl/worker.cpp b/UpdatePTUDevCtrl/worker.cpp
index ecd1b80..5c3e3ab 100644
--- a/UpdatePTUDevCtrl/worker.cpp
+++ b/UpdatePTUDevCtrl/worker.cpp
@@ -32,6 +32,8 @@ QString const Worker::UPDATE_STEP_WRONG   (  "[WRONG]");
 QString const Worker::UPDATE_STEP_FAIL   (   " [FAIL]");
 QString const Worker::UPDATE_STEP_SUCCESS(" [SUCCESS]");
 
+bool Worker::sendLastVersionOnce = false;
+
 using UPDATE_STEP = Worker::UPDATE_STEP;
 const QMap<UPDATE_STEP, const char*> Worker::smap (
     std::initializer_list<std::pair<UPDATE_STEP, const char*>>{