diff --git a/src/plugins/qmljsinspector/qmljsobserverclient.cpp b/src/plugins/qmljsinspector/qmljsobserverclient.cpp
index 58636ad5186..96edd17ba31 100644
--- a/src/plugins/qmljsinspector/qmljsobserverclient.cpp
+++ b/src/plugins/qmljsinspector/qmljsobserverclient.cpp
@@ -376,7 +376,7 @@ void QmlJSObserverClient::showAppOnTop(bool showOnTop)
     QDataStream ds(&message, QIODevice::WriteOnly);
 
     QByteArray cmd = "SHOW_APP_ON_TOP";
-    ds << showOnTop;
+    ds << cmd << showOnTop;
 
     log(LogSend, QString("%1 %2").arg(QString(cmd), showOnTop ? "true" : "false"));