diff --git a/crow/include/crow/http_connection.h b/crow/include/crow/http_connection.h
index 569f15e..51bc9fe 100644
--- a/crow/include/crow/http_connection.h
+++ b/crow/include/crow/http_connection.h
@@ -53,6 +53,7 @@
                  "</div>\n"
                  "</body>\n"
                  "</html>\n";
+    res.addHeader("Content-Type", "text/html;charset=UTF-8");
 }
 
 using namespace boost;