diff --git a/packages/components/radio/src/RadioGroup.tsx b/packages/components/radio/src/RadioGroup.tsx
index 94d8fb20b..ca4dddda7 100644
--- a/packages/components/radio/src/RadioGroup.tsx
+++ b/packages/components/radio/src/RadioGroup.tsx
@@ -64,7 +64,7 @@ export default defineComponent({
       return normalizeClass({
         [prefixCls]: true,
         [`${common.prefixCls}-button-group`]: buttoned,
-        [`${common.prefixCls}-button-group-compact`]: buttoned && (!gap || gap === '0'),
+        [`${common.prefixCls}-button-group-compact`]: buttoned && (!gap || gap === '0' || gap === '0px'),
       })
     })