diff --git a/src/client/theme-default/builtins/API/index.tsx b/src/client/theme-default/builtins/API/index.tsx
index cd74ac7bc..ab5dd4b40 100644
--- a/src/client/theme-default/builtins/API/index.tsx
+++ b/src/client/theme-default/builtins/API/index.tsx
@@ -106,7 +106,7 @@ const HANDLERS = {
       if (Array.isArray(prop.items)) return (
         <span>
           <Token>{'['}</Token>
-          {prop.items.map((item: Extract<PropertySchema, { type: 'array' }>, i) => (
+          {prop.items.map((item, i) => (
             <span key={`${i}`}>
                 {i > 0 && ', '}
                 {this.toNode(item)}