diff --git a/test/ndnSIM-api.cc b/test/ndnSIM-api.cc
index b472850..e1bd2aa 100644
--- a/test/ndnSIM-api.cc
+++ b/test/ndnSIM-api.cc
@@ -59,7 +59,7 @@
 
 private:
   void
-  GotData (Ptr<const ndn::Interest>, Ptr<const ndn::ContentObject>)
+  GotData (Ptr<const ndn::Interest>, Ptr<const ndn::Data>)
   {
     datas++;
   }