diff --git a/helper/ndn-link-control-helper.hpp b/helper/ndn-link-control-helper.hpp
index c210834..af1c385 100644
--- a/helper/ndn-link-control-helper.hpp
+++ b/helper/ndn-link-control-helper.hpp
@@ -96,7 +96,11 @@
    */
   static void
   UpLinkByName(const std::string& node1, const std::string& node2);
-}; // end: LinkControlHelper
+
+private:
+  static void
+  setErrorRate(Ptr<Node> node1, Ptr<Node> node2, double errorRate);
+}; // LinkControlHelper
 
 } // ndn
 } // ns3