diff --git a/packages/json-schema/src/types.ts b/packages/json-schema/src/types.ts
index 872acfcde15..5e893fc2c0e 100644
--- a/packages/json-schema/src/types.ts
+++ b/packages/json-schema/src/types.ts
@@ -268,6 +268,4 @@ export type ISchema<
   ['x-read-only']?: boolean
 
   ['x-read-pretty']?: boolean
-
-  [key: string]: any
 }>