diff --git a/model/pit/ndn-pit-entry-incoming-face.cc b/model/pit/ndn-pit-entry-incoming-face.cc
index 5a7f518..5e3adce 100644
--- a/model/pit/ndn-pit-entry-incoming-face.cc
+++ b/model/pit/ndn-pit-entry-incoming-face.cc
@@ -43,7 +43,7 @@
  * @brie Copy operator
  */
 IncomingFace &
-IncomingFace::operator = (IncomingFace &other)
+IncomingFace::operator = (const IncomingFace &other)
 {
   m_face = other.m_face;
   m_arrivalTime = other.m_arrivalTime;
diff --git a/model/pit/ndn-pit-entry-incoming-face.h b/model/pit/ndn-pit-entry-incoming-face.h
index 8ff7947..cd75643 100644
--- a/model/pit/ndn-pit-entry-incoming-face.h
+++ b/model/pit/ndn-pit-entry-incoming-face.h
@@ -55,7 +55,7 @@
    * @brie Copy operator
    */
   IncomingFace &
-  operator = (IncomingFace &other);
+  operator = (const IncomingFace &other);
 
   /**
    * @brief Compare two PitEntryIncomingFace
diff --git a/model/pit/ndn-pit-impl.cc b/model/pit/ndn-pit-impl.cc
index da3f4f3..c1e5eb0 100644
--- a/model/pit/ndn-pit-impl.cc
+++ b/model/pit/ndn-pit-impl.cc
@@ -182,9 +182,9 @@
   Time nextEvent = i_time.begin ()->GetExpireTime () - Simulator::Now ();
   if (nextEvent <= 0) nextEvent = Seconds (0);
   
-  // NS_LOG_DEBUG ("Schedule next cleaning in " <<
-  //               nextEvent.ToDouble (Time::S) << "s (at " <<
-  //               i_time.begin ()->GetExpireTime () << "s abs time");
+  NS_LOG_DEBUG ("Schedule next cleaning in " <<
+                nextEvent.ToDouble (Time::S) << "s (at " <<
+                i_time.begin ()->GetExpireTime () << "s abs time");
   
   m_cleanEvent = Simulator::Schedule (nextEvent,
                                       &PitImpl<Policy>::CleanExpired, this);
@@ -203,7 +203,7 @@
       typename time_index::iterator entry = i_time.begin ();
       if (entry->GetExpireTime () <= now) // is the record stale?
         {
-          m_forwardingStrategy->WillErasePendingInterest (entry->to_iterator ()->payload ());
+          m_forwardingStrategy->WillEraseTimedOutPendingInterest (entry->to_iterator ()->payload ());
           super::erase (entry->to_iterator ());
           // count ++;
         }