diff --git a/helper/ndn-stack-helper.hpp b/helper/ndn-stack-helper.hpp
index bad1234..d32769c 100644
--- a/helper/ndn-stack-helper.hpp
+++ b/helper/ndn-stack-helper.hpp
@@ -128,7 +128,7 @@
          const std::string& attr3 = "", const std::string& value3 = "",
          const std::string& attr4 = "", const std::string& value4 = "");
 
-  typedef Callback<Ptr<NetDeviceFace>, Ptr<Node>, Ptr<L3Protocol>, Ptr<NetDevice>>
+  typedef Callback<shared_ptr<NetDeviceFace>, Ptr<Node>, Ptr<L3Protocol>, Ptr<NetDevice>>
     NetDeviceFaceCreateCallback;
 
   /**
@@ -260,7 +260,7 @@
    * \param metric Routing metric
    */
   static void
-  AddRoute(Ptr<Node> node, const std::string& prefix, Ptr<Face> face, int32_t metric);
+  AddRoute(Ptr<Node> node, const std::string& prefix, shared_ptr<Face> face, int32_t metric);
 
   /**
    * @brief Add forwarding entry to FIB (work only with point-to-point links)
@@ -293,10 +293,10 @@
   SetDefaultRoutes(bool needSet);
 
 private:
-  Ptr<NetDeviceFace>
+  shared_ptr<NetDeviceFace>
   DefaultNetDeviceCallback(Ptr<Node> node, Ptr<L3Protocol> ndn, Ptr<NetDevice> netDevice) const;
 
-  Ptr<NetDeviceFace>
+  shared_ptr<NetDeviceFace>
   PointToPointNetDeviceCallback(Ptr<Node> node, Ptr<L3Protocol> ndn,
                                 Ptr<NetDevice> netDevice) const;