diff --git a/core/main.py b/core/main.py
index 3f7f03e..9849199 100644
--- a/core/main.py
+++ b/core/main.py
@@ -377,7 +377,7 @@ class EUUtilityApp:
         """Start timer to detect EU window focus and show/hide activity bar."""
         from PyQt6.QtCore import QTimer
         
-        self.eu_focus_timer = QTimer(self)
+        self.eu_focus_timer = QTimer(self.app)  # Use app as parent, not self
         self.eu_focus_timer.timeout.connect(self._check_eu_focus)
         self.eu_focus_timer.start(500)  # Check every 500ms
         self._last_eu_focused = False