diff --git a/CLOBBER b/CLOBBER
index cf37b6dfdf60..619075db8f7c 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 (MOZ) - update files in webrtc.json non_unified_sources
+Modified build files in third_party/libwebrtc - Bug 1766646 - Vendor libwebrtc from 1109dd0b39
 
diff --git a/third_party/libwebrtc/moz.build b/third_party/libwebrtc/moz.build
index e3958040b0a7..d1a46fd54cb8 100644
--- a/third_party/libwebrtc/moz.build
+++ b/third_party/libwebrtc/moz.build
@@ -321,7 +321,6 @@ DIRS += [
     "/third_party/libwebrtc/rtc_base/sanitizer_gn",
     "/third_party/libwebrtc/rtc_base/stringutils_gn",
     "/third_party/libwebrtc/rtc_base/synchronization/mutex_gn",
-    "/third_party/libwebrtc/rtc_base/synchronization/rw_lock_wrapper_gn",
     "/third_party/libwebrtc/rtc_base/synchronization/sequence_checker_gn",
     "/third_party/libwebrtc/rtc_base/synchronization/yield_gn",
     "/third_party/libwebrtc/rtc_base/synchronization/yield_policy_gn",
diff --git a/third_party/libwebrtc/rtc_base/time/timestamp_extrapolator_gn/moz.build b/third_party/libwebrtc/rtc_base/time/timestamp_extrapolator_gn/moz.build
index a99c581104f4..86756d6f6689 100644
--- a/third_party/libwebrtc/rtc_base/time/timestamp_extrapolator_gn/moz.build
+++ b/third_party/libwebrtc/rtc_base/time/timestamp_extrapolator_gn/moz.build
@@ -120,10 +120,6 @@ if CONFIG["OS_TARGET"] == "WINNT":
     DEFINES["_WINDOWS"] = True
     DEFINES["__STD_C"] = True
 
-    OS_LIBS += [
-        "winmm"
-    ]
-
 if CONFIG["CPU_ARCH"] == "aarch64":
 
     DEFINES["WEBRTC_ARCH_ARM64"] = True