diff --git a/utils/ndn-rtt-mean-deviation.cc b/utils/ndn-rtt-mean-deviation.cc
index c05ad75..88cebaa 100644
--- a/utils/ndn-rtt-mean-deviation.cc
+++ b/utils/ndn-rtt-mean-deviation.cc
@@ -74,6 +74,12 @@
   NS_LOG_FUNCTION (this);
 }
 
+TypeId
+RttMeanDeviation::GetInstanceTypeId (void) const
+{
+  return GetTypeId ();
+}
+
 void RttMeanDeviation::Measurement (Time m)
 {
   NS_LOG_FUNCTION (this << m);