diff --git a/packages/server-renderer/__tests__/ssrRenderAttrs.spec.ts b/packages/server-renderer/__tests__/ssrRenderAttrs.spec.ts
index f3bcf8d3b93..7369975f5fb 100644
--- a/packages/server-renderer/__tests__/ssrRenderAttrs.spec.ts
+++ b/packages/server-renderer/__tests__/ssrRenderAttrs.spec.ts
@@ -15,6 +15,7 @@ describe('ssr: renderAttrs', () => {
     expect(
       ssrRenderAttrs({
         key: 1,
+        ref_key: 'foo',
         ref: () => {},
         onClick: () => {}
       })
diff --git a/packages/server-renderer/src/helpers/ssrRenderAttrs.ts b/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
index 8814f1fd735..5bac3ac472c 100644
--- a/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
+++ b/packages/server-renderer/src/helpers/ssrRenderAttrs.ts
@@ -12,7 +12,7 @@ import {
 } from '@vue/shared'
 
 // leading comma for empty string ""
-const shouldIgnoreProp = makeMap(`,key,ref,innerHTML,textContent`)
+const shouldIgnoreProp = makeMap(`,key,ref,innerHTML,textContent,ref_key`)
 
 export function ssrRenderAttrs(
   props: Record<string, unknown>,