diff --git a/packages/next/server/post-process.ts b/packages/next/server/post-process.ts
index c64d406a08c07c5..ca1ec000fa2dad2 100644
--- a/packages/next/server/post-process.ts
+++ b/packages/next/server/post-process.ts
@@ -231,7 +231,7 @@ async function postProcessHTML(
       : null,
     inAmpMode || hybridAmp
       ? (html: string) => {
-          return html.replaceAll('&amp=1', '&amp=1')
+          return html.replace(/&amp=1/g, '&amp=1')
         }
       : null,
   ].filter(nonNullable)