diff --git a/include/forward_unauthorized.hpp b/include/forward_unauthorized.hpp
index 5d5e744..07836ce 100644
--- a/include/forward_unauthorized.hpp
+++ b/include/forward_unauthorized.hpp
@@ -34,8 +34,8 @@
         // If we don't have a webui installed, just return an unauthorized
         // body
         res.result(boost::beast::http::status::unauthorized);
-        res.body() =
-            "No authentication provided, and no login UI present to forward to.";
+        res.write(
+            "No authentication provided, and no login UI present to forward to.");
         return;
     }