diff --git a/ndn-cxx/util/rtt-estimator.hpp b/ndn-cxx/util/rtt-estimator.hpp
index 358fb65..bcd2c12 100644
--- a/ndn-cxx/util/rtt-estimator.hpp
+++ b/ndn-cxx/util/rtt-estimator.hpp
@@ -123,6 +123,15 @@
   }
 
   /**
+   * @brief Returns the smoothed RTT.
+   */
+  MillisecondsDouble
+  getSmoothedRtt() const
+  {
+    return m_sRtt;
+  }
+
+  /**
    * @brief Backoff RTO by a factor of Options::rtoBackoffMultiplier.
    */
   void
diff --git a/tests/unit/util/rtt-estimator.t.cpp b/tests/unit/util/rtt-estimator.t.cpp
index 01fe4f8..59041e4 100644
--- a/tests/unit/util/rtt-estimator.t.cpp
+++ b/tests/unit/util/rtt-estimator.t.cpp
@@ -92,14 +92,14 @@
 
   rttEstimator.addMeasurement(Millis(100), 1);
 
-  BOOST_CHECK_CLOSE(rttEstimator.m_sRtt.count(), 450.0, 0.001);
+  BOOST_CHECK_CLOSE(rttEstimator.getSmoothedRtt().count(), 450.0, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.m_rttVar.count(), 175.0, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.getEstimatedRto().count(), 1150.0, 0.001);
 
   // expected samples larger than 1
   rttEstimator.addMeasurement(Millis(100), 5);
 
-  BOOST_CHECK_CLOSE(rttEstimator.m_sRtt.count(), 441.25, 0.001);
+  BOOST_CHECK_CLOSE(rttEstimator.getSmoothedRtt().count(), 441.25, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.m_rttVar.count(), 183.75, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.getEstimatedRto().count(), 1176.25, 0.001);
 
@@ -110,7 +110,7 @@
   // check if minRto works
   rttEstimator.addMeasurement(Millis(100), 1);
 
-  BOOST_CHECK_CLOSE(rttEstimator.m_sRtt.count(), 100.0, 0.001);
+  BOOST_CHECK_CLOSE(rttEstimator.getSmoothedRtt().count(), 100.0, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.m_rttVar.count(), 22.5, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.getEstimatedRto().count(), 200.0, 0.001);
 
@@ -121,7 +121,7 @@
   // check if maxRto works
   rttEstimator.addMeasurement(Millis(100), 1);
 
-  BOOST_CHECK_CLOSE(rttEstimator.m_sRtt.count(), 1762.5, 0.001);
+  BOOST_CHECK_CLOSE(rttEstimator.getSmoothedRtt().count(), 1762.5, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.m_rttVar.count(), 775.0, 0.001);
   BOOST_CHECK_CLOSE(rttEstimator.getEstimatedRto().count(), 4000.0, 0.001);
 }