diff --git a/compose/cli/__init__.py b/compose/cli/__init__.py
index 35ed0437d69..461c9150c19 100644
--- a/compose/cli/__init__.py
+++ b/compose/cli/__init__.py
@@ -16,7 +16,8 @@
         [
             sys.executable, '-c',
             """import pkg_resources as pr; print "\\n".join([d.project_name for d in pr.working_set])"""
-        ], stderr=subprocess.PIPE, stdout=subprocess.PIPE
+        ],
+        stderr=subprocess.PIPE, stdout=subprocess.PIPE
     )
     packages = s_cmd.communicate()[0].splitlines()
     if 'docker-py' in packages: