diff --git a/CLOBBER b/CLOBBER
index 65714eed64d7..39c7a1654a28 100644
--- a/CLOBBER
+++ b/CLOBBER
@@ -22,5 +22,5 @@
 # changes to stick? As of bug 928195, this shouldn't be necessary! Please
 # don't change CLOBBER for WebIDL changes any more.
 
-Modified build files in third_party/libwebrtc - Bug 1766646 - Vendor libwebrtc from 78f04d8f4d
+Modified build files in third_party/libwebrtc - Bug 1766646 - Vendor libwebrtc from ae1f8f59ac
 
diff --git a/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build b/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
index ffc5a66425fd..f23b4f8b3d0c 100644
--- a/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
+++ b/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_gn/moz.build
@@ -38,6 +38,7 @@ UNIFIED_SOURCES += [
     "/third_party/libwebrtc/modules/remote_bitrate_estimator/inter_arrival.cc",
     "/third_party/libwebrtc/modules/remote_bitrate_estimator/overuse_detector.cc",
     "/third_party/libwebrtc/modules/remote_bitrate_estimator/overuse_estimator.cc",
+    "/third_party/libwebrtc/modules/remote_bitrate_estimator/packet_arrival_map.cc",
     "/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_bitrate_estimator_abs_send_time.cc",
     "/third_party/libwebrtc/modules/remote_bitrate_estimator/remote_estimator_proxy.cc"
 ]