Index: Lib/linecache.py
===================================================================
--- Lib/linecache.py	(revision 71888)
+++ Lib/linecache.py	(working copy)
@@ -80,7 +80,7 @@
     try:
         stat = os.stat(fullname)
     except os.error as msg:
-        basename = os.path.split(filename)[1]
+        basename = filename
 
         # Try for a __loader__, if available
         if module_globals and '__loader__' in module_globals: