diff --git a/.changeset/pink-teachers-sneeze.md b/.changeset/pink-teachers-sneeze.md
new file mode 100644
index 0000000..cb48fca
--- /dev/null
+++ b/.changeset/pink-teachers-sneeze.md
@@ -0,0 +1,5 @@
+---
+"capnweb": patch
+---
+
+fix: Handle `cloudflare-internal:workers` default export
diff --git a/src/core.ts b/src/core.ts
index 669ab90..e108dca 100644
--- a/src/core.ts
+++ b/src/core.ts
@@ -28,6 +28,8 @@ if (!Promise.withResolvers) {
 }
 
 let workersModule: any = (globalThis as any)[WORKERS_MODULE_SYMBOL];
+// Handle cloudflare-internal:workers which exports on `default` instead of named exports
+workersModule = workersModule?.default ?? workersModule;
 
 export interface RpcTarget {
   [__RPC_TARGET_BRAND]: never;