diff --git a/types/sharedworker/index.d.ts b/types/sharedworker/index.d.ts
index df03ac80a3..de01a0583f 100644
--- a/types/sharedworker/index.d.ts
+++ b/types/sharedworker/index.d.ts
@@ -16,7 +16,7 @@ declare namespace SharedWorker {
         port: MessagePort;
     }
 
-    interface SharedWorkerGlobalScope {
+    interface SharedWorkerGlobalScope extends Worker {
         onconnect: (event: MessageEvent) => void;
     }
 }