diff --git a/lib/userver.ts b/lib/userver.ts
index 951d3b96..5127615f 100644
--- a/lib/userver.ts
+++ b/lib/userver.ts
@@ -155,7 +155,7 @@ export class uServer extends BaseServer {
 
   private handleUpgrade(
     res: HttpResponse,
-    req: HttpRequest & { res: any; _query: any },
+    req: HttpRequest & { res: any; _query: any; headers: any },
     context
   ) {
     debug("on upgrade");
@@ -214,9 +214,9 @@ export class uServer extends BaseServer {
         {
           transport,
         },
-        req.getHeader("sec-websocket-key"),
-        req.getHeader("sec-websocket-protocol"),
-        req.getHeader("sec-websocket-extensions"),
+        req.headers["sec-websocket-key"],
+        req.headers["sec-websocket-protocol"],
+        req.headers["sec-websocket-extensions"],
         context
       );
     };