diff --git a/src/json_html_serializer.cpp b/src/json_html_serializer.cpp
index 405061b..8322f1d 100644
--- a/src/json_html_serializer.cpp
+++ b/src/json_html_serializer.cpp
@@ -562,8 +562,10 @@
 
 void prettyPrintJson(crow::Response& res)
 {
-    json_html_util::dumpHtml(res.body(), res.jsonValue);
+    std::string html;
+    json_html_util::dumpHtml(html, res.jsonValue);
 
+    res.write(std::move(html));
     res.addHeader(boost::beast::http::field::content_type,
                   "text/html;charset=UTF-8");
 }