-#!/usr/bin/python
+#!/usr/bin/env python
 
 ## zip archive frontend for git-fast-import
 ##
                        common_prefix = name[:name.rfind('/') + 1]
                else:
                        while not name.startswith(common_prefix):
-                               common_prefix = name[:name.rfind('/') + 1]
+                               last_slash = common_prefix[:-1].rfind('/') + 1
+                               common_prefix = common_prefix[:last_slash]
 
                mark[name] = ':' + str(next_mark)
                next_mark += 1