diff --git a/localization/ekf_localizer/schema/ekf_localizer.schema.json b/localization/ekf_localizer/schema/ekf_localizer.schema.json
index 7cdb56651aafd..61fbcc2973aae 100644
--- a/localization/ekf_localizer/schema/ekf_localizer.schema.json
+++ b/localization/ekf_localizer/schema/ekf_localizer.schema.json
@@ -40,7 +40,7 @@
             "diagnostics",
             "misc"
           ],
-          "additionalProperties": true
+          "additionalProperties": false
         }
       },
       "required": ["ros__parameters"],