Index: setuptools/command/bdist_egg.py
===================================================================
--- setuptools/command/bdist_egg.py	(revision 66050)
+++ setuptools/command/bdist_egg.py	(working copy)
@@ -29,7 +29,9 @@
         "   import sys, pkg_resources, imp",
         "   __file__ = pkg_resources.resource_filename(__name__,%r)"
             % resource,
-        "   del __bootstrap__, __loader__",
+        "   del __bootstrap__",
+        "   if '__loader__' in globals():",
+        "       del __loader__",
         "   imp.load_dynamic(__name__,__file__)",
         "__bootstrap__()",
         "" # terminal \n