diff --git a/src/client/auth.ts b/src/client/auth.ts
index 6fef1439..8b6eed7c 100644
--- a/src/client/auth.ts
+++ b/src/client/auth.ts
@@ -71,7 +71,7 @@ export const OAuthClientInformationSchema = z.object({
   client_secret: z.string().optional(),
   client_id_issued_at: z.number().optional(),
   client_secret_expires_at: z.number().optional(),
-}).merge(OAuthClientMetadataSchema);
+}).passthrough();
 
 export type OAuthMetadata = z.infer<typeof OAuthMetadataSchema>;
 export type OAuthTokens = z.infer<typeof OAuthTokensSchema>;