diff --git a/autoware_launch/config/localization/localization_error_monitor.param.yaml b/autoware_launch/config/localization/localization_error_monitor.param.yaml
index b4f66e7e46..def5c80164 100644
--- a/autoware_launch/config/localization/localization_error_monitor.param.yaml
+++ b/autoware_launch/config/localization/localization_error_monitor.param.yaml
@@ -4,4 +4,4 @@
     error_ellipse_size: 1.5
     warn_ellipse_size: 1.2
     error_ellipse_size_lateral_direction: 0.3
-    warn_ellipse_size_lateral_direction: 0.2
+    warn_ellipse_size_lateral_direction: 0.25