diff --git a/src/mainwindow.h b/src/mainwindow.h
index 65a21fde7..13212adbb 100644
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -155,6 +155,8 @@ private:
 #ifdef Q_OS_WIN
   bool addPythonPathToEnv();
   void installPython();
+
+private slots:
   void pythonDownloadSuccess(QString url, QString file_path);
   void pythonDownloadFailure(QString url, QString error);
 #endif