diff --git a/system_wrappers/BUILD.gn b/system_wrappers/BUILD.gn
index 5e2858f6fe..e70aea429c 100644
--- a/system_wrappers/BUILD.gn
+++ b/system_wrappers/BUILD.gn
@@ -86,8 +86,6 @@ rtc_static_library("system_wrappers") {
   if (is_win) {
     libs += [ "winmm.lib" ]
 
-    cflags = [ "/wd4334" ]  # Ignore warning on shift operator promotion.
-
     # Windows needs ../rtc_base:rtc_base due to include of
     # webrtc/rtc_base/win32.h in source/clock.cc.
     deps += [ "../rtc_base:rtc_base" ]