diff --git a/daemon/face/face.cpp b/daemon/face/face.cpp
index 9c8613b..d0bde55 100644
--- a/daemon/face/face.cpp
+++ b/daemon/face/face.cpp
@@ -23,7 +23,8 @@
   return m_id;
 }
 
-FaceId
+// this method is private and should be used only by the Forwarder
+void
 Face::setId(FaceId faceId)
 {
   m_id = faceId;
diff --git a/daemon/face/face.hpp b/daemon/face/face.hpp
index 994bc78..543fc81 100644
--- a/daemon/face/face.hpp
+++ b/daemon/face/face.hpp
@@ -86,7 +86,7 @@
   // receiveData();
   
 private:
-  FaceId
+  void
   setId(FaceId faceId);
 
 private: