1 files changed, 2 insertions, 0 deletions
diff --git a/Lib/site.py b/Lib/site.py
index 5e7ff7b..47eda24 100644
--- a/Lib/site.py
+++ b/Lib/site.py
@@ -69,6 +69,8 @@ def makepath(*paths):
 def abs__file__():
     """Set all module' __file__ attribute to an absolute path"""
     for m in sys.modules.values():
+        if hasattr(m, '__loader__'):
+            continue   # don't mess with a PEP 302-supplied __file__
         try:
             m.__file__ = os.path.abspath(m.__file__)
         except AttributeError: