diff --git a/flatland/envs/rail_env.py b/flatland/envs/rail_env.py
index 16a7743d7167ed85241bf2357d03b24d902289b3..8cd482c08bea3f72630fed3ea97c59583cbd304c 100644
--- a/flatland/envs/rail_env.py
+++ b/flatland/envs/rail_env.py
@@ -25,6 +25,7 @@ class RailEnvActions(IntEnum):
     MOVE_RIGHT = 3
     STOP_MOVING = 4
 
+
 class RailEnv(Environment):
     """
     RailEnv environment class.