diff --git a/flatland/envs/rail_env.py b/flatland/envs/rail_env.py
index 89cae88f60195aa8752fe39607f8118678395e55..7694bb207a0610deb50777346ec4d00fcb55945a 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.