diff --git a/utils/trie/multi-policy.hpp b/utils/trie/multi-policy.hpp
index 314a2a0..125df02 100644
--- a/utils/trie/multi-policy.hpp
+++ b/utils/trie/multi-policy.hpp
@@ -21,9 +21,9 @@
 #ifndef MULTI_POLICY_H_
 #define MULTI_POLICY_H_
 
-#include "detail/multi-type-container.h"
-#include "detail/multi-policy-container.h"
-#include "detail/functor-hook.h"
+#include "detail/multi-type-container.hpp"
+#include "detail/multi-policy-container.hpp"
+#include "detail/functor-hook.hpp"
 
 #include <boost/mpl/size.hpp>
 #include <boost/mpl/at.hpp>
diff --git a/utils/trie/trie-with-policy.hpp b/utils/trie/trie-with-policy.hpp
index 2ab147d..f09f13b 100644
--- a/utils/trie/trie-with-policy.hpp
+++ b/utils/trie/trie-with-policy.hpp
@@ -21,7 +21,7 @@
 #ifndef TRIE_WITH_POLICY_H_
 #define TRIE_WITH_POLICY_H_
 
-#include "trie.h"
+#include "trie.hpp"
 
 namespace ns3 {
 namespace ndn {