diff --git a/src/calamares/CalamaresWindow.cpp b/src/calamares/CalamaresWindow.cpp
index 28d62a7eb..fc7712c7d 100644
--- a/src/calamares/CalamaresWindow.cpp
+++ b/src/calamares/CalamaresWindow.cpp
@@ -108,7 +108,7 @@ CalamaresWindow::CalamaresWindow( QWidget* parent )
                 m_debugWindow = new Calamares::DebugWindow();
                 m_debugWindow->show();
                 connect( m_debugWindow, &Calamares::DebugWindow::closed,
-                         this, [ = ]
+                         this, [ = ]()
                 {
                     m_debugWindow->deleteLater();
                     debugWindowBtn->setChecked( false );