diff --git a/lexus_description/config/simulator_model.param.yaml b/lexus_description/config/simulator_model.param.yaml
index 42efb2d..2ad5e97 100644
--- a/lexus_description/config/simulator_model.param.yaml
+++ b/lexus_description/config/simulator_model.param.yaml
@@ -6,6 +6,7 @@
     initialize_source: "INITIAL_POSE_TOPIC"
     timer_sampling_time_ms: 25
     add_measurement_noise: False
+    enable_road_slope_simulation: True
     vel_lim: 50.0
     vel_rate_lim: 7.0
     steer_lim: 1.0