Index: org/python/util/jython.java
===================================================================
--- org/python/util/jython.java	(revision 3273)
+++ org/python/util/jython.java	(working copy)
@@ -47,6 +47,9 @@
                 throw Py.ValueError("jar file missing '__run__.py'");
 
             PyStringMap locals = new PyStringMap();
+            int beginIndex = -1;
+            if ((beginIndex = filename.lastIndexOf(File.separator)) != -1)
+            	filename = filename.substring(beginIndex + 1);
             locals.__setitem__("__name__", new PyString(filename));
             locals.__setitem__("zipfile", Py.java2py(zip));