diff --git a/components/anchor/Anchor.tsx b/components/anchor/Anchor.tsx
index 792251bb3e..82b871267c 100644
--- a/components/anchor/Anchor.tsx
+++ b/components/anchor/Anchor.tsx
@@ -291,7 +291,7 @@ export default class Anchor extends React.Component<AnchorProps, AnchorState, Co
     );
 
     const anchorClass = classNames(prefixCls, {
-      fixed: !affix && !showInkInFixed,
+      [`${prefixCls}-fixed`]: !affix && !showInkInFixed,
     });
 
     const wrapperStyle = {
diff --git a/components/anchor/__tests__/__snapshots__/demo.test.ts.snap b/components/anchor/__tests__/__snapshots__/demo.test.ts.snap
index 16378ac454..b6daa7f7ad 100644
--- a/components/anchor/__tests__/__snapshots__/demo.test.ts.snap
+++ b/components/anchor/__tests__/__snapshots__/demo.test.ts.snap
@@ -86,7 +86,7 @@ exports[`renders ./components/anchor/demo/customizeHighlight.md correctly 1`] =
   style="max-height:100vh"
 >
   <div
-    class="ant-anchor fixed"
+    class="ant-anchor ant-anchor-fixed"
   >
     <div
       class="ant-anchor-ink"
@@ -160,7 +160,7 @@ exports[`renders ./components/anchor/demo/onChange.md correctly 1`] = `
   style="max-height:100vh"
 >
   <div
-    class="ant-anchor fixed"
+    class="ant-anchor ant-anchor-fixed"
   >
     <div
       class="ant-anchor-ink"
@@ -234,7 +234,7 @@ exports[`renders ./components/anchor/demo/onClick.md correctly 1`] = `
   style="max-height:100vh"
 >
   <div
-    class="ant-anchor fixed"
+    class="ant-anchor ant-anchor-fixed"
   >
     <div
       class="ant-anchor-ink"
@@ -308,7 +308,7 @@ exports[`renders ./components/anchor/demo/static.md correctly 1`] = `
   style="max-height:100vh"
 >
   <div
-    class="ant-anchor fixed"
+    class="ant-anchor ant-anchor-fixed"
   >
     <div
       class="ant-anchor-ink"
diff --git a/components/anchor/style/index.less b/components/anchor/style/index.less
index 07b16a7647..1795016446 100644
--- a/components/anchor/style/index.less
+++ b/components/anchor/style/index.less
@@ -50,7 +50,7 @@
     }
   }
 
-  &.fixed &-ink &-ink-ball {
+  &-fixed &-ink &-ink-ball {
     display: none;
   }