diff --git a/lib/handlers.js b/lib/handlers.js
index 9250a34..888e813 100644
--- a/lib/handlers.js
+++ b/lib/handlers.js
@@ -76,6 +76,7 @@ module.exports.create = function (state) {
     return http.createServer(function (req, res) {
       if (!opts.servername) {
         res.statusCode = 422;
+        res.setHeader('Content-Type', 'text/plain; charset=utf-8');
         res.end(
           "3. An inexplicable temporal shift of the quantum realm... that makes me feel uncomfortable.\n\n"
         + "[ERROR] No SNI header was sent. I can only think of two possible explanations for this:\n"
@@ -87,6 +88,7 @@ module.exports.create = function (state) {
 
       // TODO use req.headers.host instead of servername (since domain fronting is disabled anyway)
       res.statusCode = 502;
+      res.setHeader('Content-Type', 'text/html; charset=utf-8');
       res.end(
         "<h1>Oops!</h1>"
       + "<p>It looks like '" + encodeURIComponent(opts.servername) + "' isn't connected right now.</p>"