diff --git a/lib/rules/unsafe-to-chain-command.js b/lib/rules/unsafe-to-chain-command.js
index bdaeadb..49c50a6 100644
--- a/lib/rules/unsafe-to-chain-command.js
+++ b/lib/rules/unsafe-to-chain-command.js
@@ -49,6 +49,7 @@ const schema = {
       default: [],
     },
   },
+  additionalProperties: false,
 }
 
 /**