diff --git a/src/dedicated-worker/index.ts b/src/dedicated-worker/index.ts
index 5de5704..bff0052 100644
--- a/src/dedicated-worker/index.ts
+++ b/src/dedicated-worker/index.ts
@@ -3,7 +3,7 @@
 
 // This fixes `self`'s type.
 declare var self: DedicatedWorkerGlobalScope;
-export type unused = 'unused';
+export {};
 
 const helloMessage = {
   hello: 'world',
diff --git a/src/service-worker/index.ts b/src/service-worker/index.ts
index 38d4e96..a0f214e 100644
--- a/src/service-worker/index.ts
+++ b/src/service-worker/index.ts
@@ -3,7 +3,7 @@
 
 // This fixes `self`'s type.
 declare var self: ServiceWorkerGlobalScope;
-export type unused = 'unused';
+export {};
 
 console.log(self.clients);