diff --git a/tools/sim/scenarios/metadrive/stay_in_lane.py b/tools/sim/scenarios/metadrive/stay_in_lane.py
index 6d5f680247..17d3d28a2d 100755
--- a/tools/sim/scenarios/metadrive/stay_in_lane.py
+++ b/tools/sim/scenarios/metadrive/stay_in_lane.py
@@ -67,6 +67,7 @@ class MetaDriveBridge(SimulatorBridge):
       crash_object_done=True,
       traffic_density=0.0,
       map_config=create_map(),
+      map_region_size=2048,
       decision_repeat=1,
       physics_world_step_size=self.TICKS_PER_FRAME/100,
       preload_models=False