diff --git a/components/modal/style/confirm.ts b/components/modal/style/confirm.ts
index 874d11e4fe..6a1e3b6a53 100644
--- a/components/modal/style/confirm.ts
+++ b/components/modal/style/confirm.ts
@@ -67,7 +67,7 @@ const genModalConfirmStyle: GenerateStyle<ModalToken> = (token) => {
         flex: 'auto',
         rowGap: token.marginXS,
         // https://github.com/ant-design/ant-design/issues/51912
-        maxWidth: `calc(100% - ${unit(token.calc(token.marginSM).equal())})`,
+        maxWidth: `calc(100% - ${unit(token.marginSM)})`,
       },
 
       // https://github.com/ant-design/ant-design/issues/48159