diff --git a/black_screen_dim.py b/black_screen_dim.py
index d6f6e9f..a7e9bc1 100644
--- a/black_screen_dim.py
+++ b/black_screen_dim.py
@@ -259,7 +259,7 @@ if sys.platform == "win32":
             _hint_active = False
             user32.KillTimer(hwnd, 1)
             for h in _hwnds:
-                user32.InvalidateRect(h, None, False)
+                user32.InvalidateRect(h, None, True)
             return 0
         if msg in (WM_DESTROY, WM_CLOSE):
             user32.PostQuitMessage(0)