diff --git a/.eleventy.js b/.eleventy.js
index d48d7ac..b2f39d6 100644
--- a/.eleventy.js
+++ b/.eleventy.js
@@ -89,6 +89,7 @@ module.exports = function(eleventyConfig) {
 
         browserSync.addMiddleware("*", (req, res) => {
           // Provides the 404 content without redirect.
+          res.writeHead(404, {"Content-Type": "text/html; charset=UTF-8"});
           res.write(content_404);
           res.end();
         });