diff --git a/keystone/cmd/manage.py b/keystone/cmd/manage.py
index da38278ea6..707c9933df 100644
--- a/keystone/cmd/manage.py
+++ b/keystone/cmd/manage.py
@@ -20,7 +20,7 @@ import sys
 # If ../../keystone/__init__.py exists, add ../../ to Python search path, so
 # that it will override what happens to be installed in
 # /usr/(local/)lib/python...
-possible_topdir = os.path.normpath(os.path.join(os.path.abspath(sys.argv[0]),
+possible_topdir = os.path.normpath(os.path.join(os.path.abspath(__file__),
                                    os.pardir,
                                    os.pardir,
                                    os.pardir))