diff --git a/components/input-number/demo/formatter.md b/components/input-number/demo/formatter.md
index b2d58cb4e5..ecf25cf0b0 100644
--- a/components/input-number/demo/formatter.md
+++ b/components/input-number/demo/formatter.md
@@ -24,7 +24,7 @@ ReactDOM.render(
   <div>
     <InputNumber
       defaultValue={1000}
-      formatter={value => `$ ${value.replace(/\B(?=(\d{3})+(?!\d))/g, ',')}`}
+      formatter={value => `$ ${value}`.replace(/\B(?=(\d{3})+(?!\d))/g, ',')}
       parser={value => value.replace(/\$\s?|(,*)/g, '')}
       onChange={onChange}
     />