diff --git a/src/VehicleSetup/FirmwareUpgradeController.cc b/src/VehicleSetup/FirmwareUpgradeController.cc
index 9a3e5dfd..58a2adc 100644
--- a/src/VehicleSetup/FirmwareUpgradeController.cc
+++ b/src/VehicleSetup/FirmwareUpgradeController.cc
@@ -901,7 +901,7 @@ void FirmwareUpgradeController::_ardupilotManifestDownloadFinished(QString remot
 
     QString         errorString;
     QJsonDocument   doc;
-    if (JsonHelper::isJsonFile(jsonFileName, doc, errorString)) {
+    if (!JsonHelper::isJsonFile(jsonFileName, doc, errorString)) {
         qCWarning(FirmwareUpgradeLog) << "Json file read failed" << errorString;
         return;
     }