diff --git a/packages/react-ai-sdk/src/rsc/VercelRSCAdapter.tsx b/packages/react-ai-sdk/src/rsc/VercelRSCAdapter.tsx
index 8937575ca..297431b28 100644
--- a/packages/react-ai-sdk/src/rsc/VercelRSCAdapter.tsx
+++ b/packages/react-ai-sdk/src/rsc/VercelRSCAdapter.tsx
@@ -9,9 +9,9 @@ type RSCMessageConverter<T> = {
 type VercelRSCAdapterBase<T> = {
   messages: T[];
   append: (message: AppendMessage) => Promise<void>;
-  edit?: (message: AppendMessage) => Promise<void> | undefined;
-  reload?: (parentId: string | null) => Promise<void> | undefined;
-  convertMessage?: (message: T) => VercelRSCMessage | undefined;
+  edit?: ((message: AppendMessage) => Promise<void>) | undefined;
+  reload?: ((parentId: string | null) => Promise<void>) | undefined;
+  convertMessage?: ((message: T) => VercelRSCMessage) | undefined;
 };
 
 export type VercelRSCAdapter<T = VercelRSCMessage> = VercelRSCAdapterBase<T> &