diff --git a/metadrive/examples/drive_in_waymo_env.py b/metadrive/examples/drive_in_waymo_env.py
index 184ef5956..099d26c1a 100644
--- a/metadrive/examples/drive_in_waymo_env.py
+++ b/metadrive/examples/drive_in_waymo_env.py
@@ -7,7 +7,6 @@
 
 
 class DemoWaymoEnv(WaymoEnv):
-
     def reset(self, force_seed=None):
         if self.engine is not None:
             seeds = [i for i in range(self.config["case_num"])]