diff --git a/src/calibre/gui2/main.py b/src/calibre/gui2/main.py
index d48ca09dff..8e7b7396df 100644
--- a/src/calibre/gui2/main.py
+++ b/src/calibre/gui2/main.py
@@ -132,7 +132,7 @@ def init_qt(args):
     # Ancient broken VNC servers cannot handle icons of size greater than 256
     # https://www.mobileread.com/forums/showthread.php?t=278447
     ic = 'lt.png' if is_x11 else 'library.png'
-    app.setWindowIcon(QIcon.ic(ic))
+    app.setWindowIcon(QIcon(I(ic, allow_user_override=False)))
     return app, opts, args