diff --git a/daemon/face/websocket-factory.hpp b/daemon/face/websocket-factory.hpp
index a31c7cd..60f0a69 100644
--- a/daemon/face/websocket-factory.hpp
+++ b/daemon/face/websocket-factory.hpp
@@ -37,6 +37,9 @@
 class WebSocketFactory : public ProtocolFactory
 {
 public:
+  static const std::string&
+  getId();
+
   /** \brief process face_system.websocket config section
    */
   void