diff --git a/http_server/_server_connection.pony b/http_server/_server_connection.pony
index af2f0ee..01af136 100644
--- a/http_server/_server_connection.pony
+++ b/http_server/_server_connection.pony
@@ -291,6 +291,6 @@ actor _ServerConnection is (Session & HTTP11RequestHandler)
       dispose()
     end
 
-  be upgrade(notify: TCPConnectionNotify iso) =>
+  be upgrade_protocol(notify: TCPConnectionNotify iso) =>
     _conn.set_notify(consume notify)