diff --git a/poetry/utils/env.py b/poetry/utils/env.py
index ca0139e0515..e54304ad700 100644
--- a/poetry/utils/env.py
+++ b/poetry/utils/env.py
@@ -1152,7 +1152,7 @@ def __init__(
         pip_version="19.1",
         sys_path=None,
         config_vars=None,
-        **kwargs,
+        **kwargs
     ):
         super(MockEnv, self).__init__(**kwargs)