diff --git a/client/adventureMap/TurnTimerWidget.h b/client/adventureMap/TurnTimerWidget.h
index 621f99c29..5af6739ea 100644
--- a/client/adventureMap/TurnTimerWidget.h
+++ b/client/adventureMap/TurnTimerWidget.h
@@ -28,7 +28,7 @@ class TurnTimerWidget : public CIntObject
 	int lastSoundCheckSeconds;
 	bool isBattleMode;
 
-	std::set<int> notificationThresholds;
+	const std::set<int> notificationThresholds = {0, 1, 2, 3, 4, 5, 10, 20, 30};
 
 	std::map<PlayerColor, std::shared_ptr<CLabel>> playerLabelsMain;
 	std::map<PlayerColor, std::shared_ptr<CLabel>> playerLabelsBattle;