diff --git a/cognito-user-pool-client/schema.json b/cognito-user-pool-client/schema.json
index bca45c4..0a13e93 100644
--- a/cognito-user-pool-client/schema.json
+++ b/cognito-user-pool-client/schema.json
@@ -21,7 +21,7 @@
       "type": "array"
     },
     "RefreshTokenValidity": {
-      "type": "number"
+      "type": "string"
     },
     "WriteAttributes": {
       "type": "array"