diff --git a/webpack.dev-server.config.js b/webpack.dev-server.config.js
index d166deedc..a6ffc307b 100644
--- a/webpack.dev-server.config.js
+++ b/webpack.dev-server.config.js
@@ -67,7 +67,7 @@ module.exports = (env) => {
       return;
     }
 
-    const locationUrl = new URL(location);
+    const locationUrl = new URL(location, backendUrl);
 
     if (locationUrl.host !== backendUrl.host) {
       return;