diff --git a/update.cpp b/update.cpp
index 60b38ee..2a34d8a 100644
--- a/update.cpp
+++ b/update.cpp
@@ -644,6 +644,7 @@ bool Update::doUpdate() {
     }
 
     bool serialOpened = false;
+    bool serialOpen = false;
 
     QStringList linesToWorkOn = getLinesToWorkOn();
     if (linesToWorkOn.size() == 0) {