diff --git a/video/receive_statistics_proxy.cc b/video/receive_statistics_proxy.cc
index 4f3b6b9db8..42ab7e19ec 100644
--- a/video/receive_statistics_proxy.cc
+++ b/video/receive_statistics_proxy.cc
@@ -692,6 +692,7 @@ void ReceiveStatisticsProxy::OnDecodedFrame(const VideoFrame& frame,
   } else if (stats_.qp_sum) {
     RTC_LOG(LS_WARNING)
         << "QP sum was already set and no QP was given for a frame.";
+    stats_.qp_sum.reset();
   }
   decode_time_counter_.Add(decode_time_ms);
   stats_.decode_ms = decode_time_ms;
diff --git a/video/receive_statistics_proxy_unittest.cc b/video/receive_statistics_proxy_unittest.cc
index e5727894f6..fffc42ce0d 100644
--- a/video/receive_statistics_proxy_unittest.cc
+++ b/video/receive_statistics_proxy_unittest.cc
@@ -352,7 +352,7 @@ TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameWithoutQpQpSumWontExist) {
   EXPECT_EQ(absl::nullopt, statistics_proxy_->GetStats().qp_sum);
 }
 
-TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameWithoutQpDoesNotResetQpSum) {
+TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameWithoutQpResetsQpSum) {
   webrtc::VideoFrame frame = CreateFrame(kWidth, kHeight);
   EXPECT_EQ(absl::nullopt, statistics_proxy_->GetStats().qp_sum);
   statistics_proxy_->OnDecodedFrame(frame, 3u, 0,
@@ -360,7 +360,7 @@ TEST_F(ReceiveStatisticsProxyTest, OnDecodedFrameWithoutQpDoesNotResetQpSum) {
   EXPECT_EQ(3u, statistics_proxy_->GetStats().qp_sum);
   statistics_proxy_->OnDecodedFrame(frame, absl::nullopt, 0,
                                     VideoContentType::UNSPECIFIED);
-  EXPECT_EQ(3u, statistics_proxy_->GetStats().qp_sum);
+  EXPECT_EQ(absl::nullopt, statistics_proxy_->GetStats().qp_sum);
 }
 
 TEST_F(ReceiveStatisticsProxyTest, OnRenderedFrameIncreasesFramesRendered) {