diff --git a/packages/next/server/post-process.ts b/packages/next/server/post-process.ts
index 36e6f3911aefc..1839593519f33 100644
--- a/packages/next/server/post-process.ts
+++ b/packages/next/server/post-process.ts
@@ -180,7 +180,7 @@ class FontOptimizerMiddleware implements PostProcessMiddleware {
 
 async function postOptimizeHTML(
   pathname: string,
-  html: string,
+  content: string,
   renderOpts: RenderOpts,
   { inAmpMode, hybridAmp }: { inAmpMode: boolean; hybridAmp: boolean }
 ) {
@@ -242,10 +242,10 @@ async function postOptimizeHTML(
 
   for (const postProcessor of postProcessors) {
     if (postProcessor) {
-      html = await postProcessor(html)
+      content = await postProcessor(content)
     }
   }
-  return html
+  return content
 }
 
 // Initialization
@@ -257,4 +257,4 @@ registerPostProcessor(
   (options) => options.optimizeFonts || process.env.__NEXT_OPTIMIZE_FONTS
 )
 
-export { processHTML, postOptimizeHTML }
+export { postOptimizeHTML }
diff --git a/packages/next/server/render.tsx b/packages/next/server/render.tsx
index 1be5ef7c2bfca..97980e0d53342 100644
--- a/packages/next/server/render.tsx
+++ b/packages/next/server/render.tsx
@@ -465,7 +465,6 @@ export async function renderToHTML(
     ampPath = '',
     pageConfig = {},
     buildManifest,
-    fontManifest,
     reactLoadableManifest,
     ErrorDebug,
     getStaticProps,
@@ -1740,6 +1739,7 @@ export async function renderToHTML(
 
   const postOptimize = (html: string) =>
     postOptimizeHTML(pathname, html, renderOpts, { inAmpMode, hybridAmp })
+
   if (generateStaticHTML) {
     const html = await streamToString(chainStreams(streams))
     const optimizedHtml = await postOptimize(html)