diff --git a/utils/ndn-rtt-estimator.cc b/utils/ndn-rtt-estimator.cc
index 93193d2..b0d2b83 100644
--- a/utils/ndn-rtt-estimator.cc
+++ b/utils/ndn-rtt-estimator.cc
@@ -158,6 +158,12 @@
   NS_LOG_FUNCTION (this);
 }
 
+TypeId
+RttEstimator::GetInstanceTypeId (void) const
+{
+  return GetTypeId ();
+}
+
 void RttEstimator::SentSeq (SequenceNumber32 seq, uint32_t size)
 {
   NS_LOG_FUNCTION (this << seq << size);