diff --git a/localization/ekf_localizer/config/ekf_localizer.param.yaml b/localization/ekf_localizer/config/ekf_localizer.param.yaml
index 322325d239004..4d3f5b9643462 100644
--- a/localization/ekf_localizer/config/ekf_localizer.param.yaml
+++ b/localization/ekf_localizer/config/ekf_localizer.param.yaml
@@ -1,7 +1,7 @@
 /**:
   ros__parameters:
     show_debug_info: false
-    enable_yaw_bias_estimation: True
+    enable_yaw_bias_estimation: true
     predict_frequency: 50.0
     tf_rate: 50.0
     extend_state_step: 50