diff --git a/lib/validator.js b/lib/validator.js
index 26c93f28..bb261d52 100644
--- a/lib/validator.js
+++ b/lib/validator.js
@@ -21,7 +21,7 @@ class Validator {
       keyword: 'fjs_type',
       type: 'object',
       errors: false,
-      validate: (type, date) => {
+      validate: (_type, date) => {
         return date instanceof Date
       }
     })