diff --git a/packages/dev-middleware/src/inspector-proxy/InspectorProxy.js b/packages/dev-middleware/src/inspector-proxy/InspectorProxy.js
index 0f4146d5e01884..532bf06c0b457c 100644
--- a/packages/dev-middleware/src/inspector-proxy/InspectorProxy.js
+++ b/packages/dev-middleware/src/inspector-proxy/InspectorProxy.js
@@ -258,7 +258,7 @@ export default class InspectorProxy implements InspectorProxyQueries {
         }
 
         device.handleDebuggerConnection(socket, pageId, {
-          userAgent: req.headers['user-agent'] ?? null,
+          userAgent: req.headers['user-agent'] ?? query.userAgent ?? null,
         });
       } catch (e) {
         console.error(e);