diff --git a/typescript/widget/numberinterval/numberinterval.ts b/typescript/widget/numberinterval/numberinterval.ts
index ea51b9550..17ec1d15d 100644
--- a/typescript/widget/numberinterval/numberinterval.ts
+++ b/typescript/widget/numberinterval/numberinterval.ts
@@ -16,6 +16,7 @@ export declare class NumberInterval extends Single {
         closeMax?: boolean;
         validation?: 'invalid' | 'valid';
         numTip?: string;
+        simple?: boolean;
     } & Single['props'];
 
     isStateValid(): boolean;