diff --git a/AdaptiveBrightness/main_window.hpp b/AdaptiveBrightness/main_window.hpp
index 8d2ea9f..131f3bd 100644
--- a/AdaptiveBrightness/main_window.hpp
+++ b/AdaptiveBrightness/main_window.hpp
@@ -32,5 +32,5 @@ class MainWindow : public QMainWindow {
     QMenu* m_trayIconMenu = nullptr;
     QSystemTrayIcon* m_trayIcon = nullptr;
 
-    QTimer* m_timer;
+    QTimer* m_timer = nullptr;
 };