diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
index 7ff1412bb..acc2c266e 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.cc
@@ -1135,10 +1135,13 @@ int32_t ModuleRtpRtcpImpl::SendNACK(const uint16_t* nack_list,
                id_,
                "SendNACK(size:%u)", size);
 
-  uint16_t avg_rtt = 0;
-  rtcp_receiver_.RTT(rtcp_receiver_.RemoteSSRC(), NULL, &avg_rtt, NULL, NULL);
+  // Use RTT from RtcpRttStats class if provided.
+  uint16_t rtt = rtt_ms();
+  if (rtt == 0) {
+    rtcp_receiver_.RTT(rtcp_receiver_.RemoteSSRC(), NULL, &rtt, NULL, NULL);
+  }
 
-  int64_t wait_time = 5 + ((avg_rtt * 3) >> 1);  // 5 + RTT * 1.5.
+  int64_t wait_time = 5 + ((rtt * 3) >> 1);  // 5 + RTT * 1.5.
   if (wait_time == 5) {
     wait_time = 100;  // During startup we don't have an RTT.
   }
@@ -1597,9 +1600,12 @@ void ModuleRtpRtcpImpl::OnReceivedNACK(
       nack_sequence_numbers.size() == 0) {
     return;
   }
-  uint16_t avg_rtt = 0;
-  rtcp_receiver_.RTT(rtcp_receiver_.RemoteSSRC(), NULL, &avg_rtt, NULL, NULL);
-  rtp_sender_.OnReceivedNACK(nack_sequence_numbers, avg_rtt);
+  // Use RTT from RtcpRttStats class if provided.
+  uint16_t rtt = rtt_ms();
+  if (rtt == 0) {
+    rtcp_receiver_.RTT(rtcp_receiver_.RemoteSSRC(), NULL, &rtt, NULL, NULL);
+  }
+  rtp_sender_.OnReceivedNACK(nack_sequence_numbers, rtt);
 }
 
 int32_t ModuleRtpRtcpImpl::LastReceivedNTP(
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
index b7a1fb129..7e0425f3b 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl.h
@@ -405,6 +405,7 @@ class ModuleRtpRtcpImpl : public RtpRtcp {
   Clock*                    clock_;
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(RtpRtcpImplTest, Rtt);
   FRIEND_TEST_ALL_PREFIXES(RtpRtcpImplTest, RttForReceiverOnly);
   int64_t RtcpReportInterval();
   void SetRtcpReceiverSsrcs(uint32_t main_ssrc);
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl_unittest.cc
index 6248f4970..50f7f2e1c 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_rtcp_impl_unittest.cc
@@ -122,6 +122,13 @@ TEST_F(RtpRtcpImplTest, Rtt) {
   // No RTT from other ssrc.
   EXPECT_EQ(-1,
       rtp_rtcp_impl_->RTT(kSsrc + 1, &rtt, &avg_rtt, &min_rtt, &max_rtt));
+
+  // Verify RTT from rtt_stats config.
+  EXPECT_EQ(0U, rtt_stats_.LastProcessedRtt());
+  EXPECT_EQ(0U, rtp_rtcp_impl_->rtt_ms());
+  rtp_rtcp_impl_->Process();
+  EXPECT_EQ(100U, rtt_stats_.LastProcessedRtt());
+  EXPECT_EQ(100U, rtp_rtcp_impl_->rtt_ms());
 }
 
 TEST_F(RtpRtcpImplTest, SetRtcpXrRrtrStatus) {
@@ -147,7 +154,6 @@ TEST_F(RtpRtcpImplTest, RttForReceiverOnly) {
   // Verify RTT.
   EXPECT_EQ(0U, rtt_stats_.LastProcessedRtt());
   EXPECT_EQ(0U, rtp_rtcp_impl_->rtt_ms());
-
   rtp_rtcp_impl_->Process();
   EXPECT_EQ(100U, rtt_stats_.LastProcessedRtt());
   EXPECT_EQ(100U, rtp_rtcp_impl_->rtt_ms());