diff --git a/utils/ndn-rtt-estimator.cpp b/utils/ndn-rtt-estimator.cpp
index b0d2b83..9e63cef 100644
--- a/utils/ndn-rtt-estimator.cpp
+++ b/utils/ndn-rtt-estimator.cpp
@@ -28,7 +28,7 @@
 
 #include <iostream>
 
-#include "ndn-rtt-estimator.h"
+#include "ndn-rtt-estimator.hpp"
 #include "ns3/simulator.h"
 #include "ns3/double.h"
 #include "ns3/integer.h"