diff --git a/UI/window-basic-settings.hpp b/UI/window-basic-settings.hpp
index 69054d344..51179a2cd 100644
--- a/UI/window-basic-settings.hpp
+++ b/UI/window-basic-settings.hpp
@@ -377,7 +377,7 @@ private slots:
 	void SetAdvancedIcon(const QIcon &icon);
 
 protected:
-	virtual void closeEvent(QCloseEvent *event);
+	virtual void closeEvent(QCloseEvent *event) override;
 	void reject() override;
 
 public: