diff --git a/baselines/common/vec_env/__init__.py b/baselines/common/vec_env/__init__.py
index a460e80..b3cdca7 100644
--- a/baselines/common/vec_env/__init__.py
+++ b/baselines/common/vec_env/__init__.py
@@ -30,13 +30,12 @@ class VecEnv(ABC):
     each observation becomes an batch of observations, and expected action is a batch of actions to
     be applied per-environment.
     """
-
+    closed = False
+    viewer = None
     def __init__(self, num_envs, observation_space, action_space):
         self.num_envs = num_envs
         self.observation_space = observation_space
         self.action_space = action_space
-        self.closed = False
-        self.viewer = None # For rendering
 
     @abstractmethod
     def reset(self):