diff --git a/src/manage/aliasutils.py b/src/manage/aliasutils.py
index e94e776..1a33a3e 100644
--- a/src/manage/aliasutils.py
+++ b/src/manage/aliasutils.py
@@ -23,7 +23,7 @@
 
 # Avoid letting __main__.__file__ lead back to this script
 try:
-    __file__ = None
+    del __file__
 except Exception:
     pass