diff --git a/repertory/repertory/src/ui/handlers.cpp b/repertory/repertory/src/ui/handlers.cpp
index 82fc4f4c..f9e7d05f 100644
--- a/repertory/repertory/src/ui/handlers.cpp
+++ b/repertory/repertory/src/ui/handlers.cpp
@@ -39,8 +39,9 @@ handlers::handlers(mgmt_app_config *config, httplib::Server *server)
         }
 
         res.status = http_error_codes::unauthorized;
-        res.headers["WWW-Authenticate"] =
-            R"(Basic realm="Repertory Management Portal", charset="UTF-8")";
+        res.set_header(
+            "WWW-Authenticate",
+            R"(Basic realm="Repertory Management Portal", charset="UTF-8")");
         return httplib::Server::HandlerResponse::Handled;
       });