diff --git a/index.d.ts b/index.d.ts
index 21caab6a..495fcefe 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -174,7 +174,7 @@ declare module '@cloudflare/workers-types' {
 
     delete(key: string): Promise<void>
 
-    list(options: {
+    list(options?: {
       prefix?: string
       limit?: number
       cursor?: string