diff --git a/src/client/auth.ts b/src/client/auth.ts
index b54261d3..f77efe88 100644
--- a/src/client/auth.ts
+++ b/src/client/auth.ts
@@ -489,8 +489,10 @@ export async function discoverOAuthMetadata(
   issuer: string | URL,
   {
     authorizationServerUrl,
+    protocolVersion,
   }: {
     authorizationServerUrl?: string | URL,
+    protocolVersion?: string,
   } = {},
 ): Promise<OAuthMetadata | undefined> {
   if (typeof issuer === 'string') {