diff --git a/src/mcp/client/auth/oauth2.py b/src/mcp/client/auth/oauth2.py
index f16e84db2..6bd09d9da 100644
--- a/src/mcp/client/auth/oauth2.py
+++ b/src/mcp/client/auth/oauth2.py
@@ -506,7 +506,7 @@ async def async_auth_flow(self, request: httpx.Request) -> AsyncGenerator[httpx.
 
                     # Step 3: Apply scope selection strategy
                     self.context.client_metadata.scope = get_client_metadata_scopes(
-                        www_auth_resource_metadata_url,
+                        extract_scope_from_www_auth(response),
                         self.context.protected_resource_metadata,
                         self.context.oauth_metadata,
                     )