diff --git a/model/pit/ndn-pit-impl.h b/model/pit/ndn-pit-impl.h
index 6a8dfcd..85f11c8 100644
--- a/model/pit/ndn-pit-impl.h
+++ b/model/pit/ndn-pit-impl.h
@@ -81,7 +81,7 @@
 
   // inherited from Pit
   virtual Ptr<Entry>
-  Lookup (const ContentObject &header);
+  Lookup (const Data &header);
 
   virtual Ptr<Entry>
   Lookup (const Interest &header);
@@ -300,7 +300,7 @@
 
 template<class Policy>
 Ptr<Entry>
-PitImpl<Policy>::Lookup (const ContentObject &header)
+PitImpl<Policy>::Lookup (const Data &header)
 {
   /// @todo use predicate to search with exclude filters
   typename super::iterator item = super::longest_prefix_match_if (header.GetName (), EntryIsNotEmpty ());
diff --git a/model/pit/ndn-pit.h b/model/pit/ndn-pit.h
index 0699479..1185892 100644
--- a/model/pit/ndn-pit.h
+++ b/model/pit/ndn-pit.h
@@ -44,11 +44,11 @@
 
 class L3Protocol;
 class Face;
-class ContentObject;
+class Data;
 class Interest;
 
 typedef Interest InterestHeader;
-typedef ContentObject ContentObjectHeader;
+typedef Data DataHeader;
 
 ////////////////////////////////////////////////////////////////////////
 ////////////////////////////////////////////////////////////////////////
@@ -89,7 +89,7 @@
    *          returns 0
    */
   virtual Ptr<pit::Entry>
-  Lookup (const ContentObject &header) = 0;
+  Lookup (const Data &header) = 0;
 
   /**
    * \brief Find a PIT entry for the given content interest