diff --git a/documentation/docs/html-rewriter/HTMLRewritingStream/HTMLRewritingStream.mdx b/documentation/docs/html-rewriter/HTMLRewritingStream/HTMLRewritingStream.mdx
index af4387c22d..25aa47aa4a 100644
--- a/documentation/docs/html-rewriter/HTMLRewritingStream/HTMLRewritingStream.mdx
+++ b/documentation/docs/html-rewriter/HTMLRewritingStream/HTMLRewritingStream.mdx
@@ -36,7 +36,7 @@ async function handleRequest(event) {
   return new Response(body, {
     status: 200,
     headers: new Headers({
-      "content-type": "text/html"
+      "content-type": "text/html; charset=utf-8",
     })
   })
 }
diff --git a/documentation/docs/html-rewriter/HTMLRewritingStream/prototype/onElement.mdx b/documentation/docs/html-rewriter/HTMLRewritingStream/prototype/onElement.mdx
index c4b5982525..21bc5388c5 100644
--- a/documentation/docs/html-rewriter/HTMLRewritingStream/prototype/onElement.mdx
+++ b/documentation/docs/html-rewriter/HTMLRewritingStream/prototype/onElement.mdx
@@ -81,7 +81,7 @@ async function handleRequest(event) {
   return new Response(body, {
     status: 200,
     headers: new Headers({
-      "content-type": "text/html"
+      "content-type": "text/html; charset=utf-8",
     })
   })
 }