diff --git a/model/fib/ndn-fib-impl.h b/model/fib/ndn-fib-impl.h
index 9b45ba2..0755b35 100644
--- a/model/fib/ndn-fib-impl.h
+++ b/model/fib/ndn-fib-impl.h
@@ -86,7 +86,7 @@
   FibImpl ();
 
   virtual Ptr<Entry>
-  LongestPrefixMatch (const InterestHeader &interest);
+  LongestPrefixMatch (const Interest &interest);
   
   virtual Ptr<Entry>
   Add (const Name &prefix, Ptr<Face> face, int32_t metric);