diff --git a/pc/rtc_stats_collector.cc b/pc/rtc_stats_collector.cc
index 4735805342..8b6a5fb6cf 100644
--- a/pc/rtc_stats_collector.cc
+++ b/pc/rtc_stats_collector.cc
@@ -269,9 +269,12 @@ std::map<std::string, double>
 QualityLimitationDurationToRTCQualityLimitationDuration(
     std::map<webrtc::QualityLimitationReason, int64_t> durations_ms) {
   std::map<std::string, double> result;
+  // The internal duration is defined in milliseconds while the spec defines
+  // the value in seconds:
+  // https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats-qualitylimitationdurations
   for (const auto& elem : durations_ms) {
     result[QualityLimitationReasonToRTCQualityLimitationReason(elem.first)] =
-        elem.second;
+        elem.second / static_cast<double>(rtc::kNumMillisecsPerSec);
   }
   return result;
 }
diff --git a/pc/rtc_stats_collector_unittest.cc b/pc/rtc_stats_collector_unittest.cc
index fb9ba96f92..971d8d3b7f 100644
--- a/pc/rtc_stats_collector_unittest.cc
+++ b/pc/rtc_stats_collector_unittest.cc
@@ -2329,7 +2329,7 @@ TEST_F(RTCStatsCollectorTest, CollectRTCOutboundRTPStreamStats_Video) {
   expected_video.total_packet_send_delay = 10.0;
   expected_video.quality_limitation_reason = "bandwidth";
   expected_video.quality_limitation_durations = std::map<std::string, double>{
-      std::pair<std::string, double>{"bandwidth", 300.0},
+      std::pair<std::string, double>{"bandwidth", 0.3},
   };
   expected_video.quality_limitation_resolution_changes = 56u;
   expected_video.frame_width = 200u;
diff --git a/video/quality_limitation_reason_tracker.h b/video/quality_limitation_reason_tracker.h
index 22816a8272..15bc90773a 100644
--- a/video/quality_limitation_reason_tracker.h
+++ b/video/quality_limitation_reason_tracker.h
@@ -24,6 +24,8 @@ namespace webrtc {
 // duration of time spent in each reason. See qualityLimitationReason[1],
 // qualityLimitationDurations[2], and qualityLimitationResolutionChanges[3] in
 // the webrtc-stats spec.
+// Note that the specification defines the durations in seconds while the
+// internal data structures defines it in milliseconds.
 // [1]
 // https://w3c.github.io/webrtc-stats/#dom-rtcoutboundrtpstreamstats-qualitylimitationreason
 // [2]