diff --git a/Lib/shutil.py b/Lib/shutil.py
index 2a2be9e..703b3b5 100644
--- a/Lib/shutil.py
+++ b/Lib/shutil.py
@@ -9,7 +9,6 @@
 import stat
 from os.path import abspath
 import fnmatch
-from warnings import warn
 import collections
 import errno
 
@@ -393,7 +392,7 @@
 
     return archive_name
 
-def _call_external_zip(directory, verbose=False):
+def _call_external_zip(base_dir, zip_filename, verbose=False, dry_run=False):
     # XXX see if we want to keep an external call here
     if verbose:
         zipoptions = "-r"
@@ -437,7 +436,7 @@
         zipfile = None
 
     if zipfile is None:
-        _call_external_zip(base_dir, verbose)
+        _call_external_zip(base_dir, zip_filename, verbose, dry_run)
     else:
         if logger is not None:
             logger.info("creating '%s' and adding '%s' to it",