diff --git a/lib/src/http/server.dart b/lib/src/http/server.dart
index 0b4af3b8..ac4ecbc7 100644
--- a/lib/src/http/server.dart
+++ b/lib/src/http/server.dart
@@ -19,7 +19,7 @@ class Angel extends Routable {
   AngelErrorHandler _errorHandler = (AngelHttpException e, req, ResponseContext res) {
     res.header(HttpHeaders.CONTENT_TYPE, ContentType.HTML.toString());
     res.status(e.statusCode);
-    res.write("<DOCTYPE html><html><head><title>${e.message}</title>");
+    res.write("<!DOCTYPE html><html><head><title>${e.message}</title>");
     res.write("</head><body><h1>${e.message}</h1><ul>");
     for (String error in e.errors) {
       res.write("<li>$error</li>");
