diff --git a/rtc_base/platform_thread.cc b/rtc_base/platform_thread.cc
index 1324069210..872ebb612e 100644
--- a/rtc_base/platform_thread.cc
+++ b/rtc_base/platform_thread.cc
@@ -239,12 +239,8 @@ bool PlatformThread::SetPriority(ThreadPriority priority) {
   // TODO(tommi): Switch to the same mechanism as Chromium uses for changing
   // thread priorities.
   return true;
-#else
-#ifdef WEBRTC_THREAD_RR
-  const int policy = SCHED_RR;
 #else
   const int policy = SCHED_FIFO;
-#endif
   const int min_prio = sched_get_priority_min(policy);
   const int max_prio = sched_get_priority_max(policy);
   if (min_prio == -1 || max_prio == -1) {
diff --git a/system_wrappers/BUILD.gn b/system_wrappers/BUILD.gn
index ffd7a78e49..ee24c8bf18 100644
--- a/system_wrappers/BUILD.gn
+++ b/system_wrappers/BUILD.gn
@@ -42,8 +42,6 @@ rtc_static_library("system_wrappers") {
   ]
 
   if (is_android) {
-    defines += [ "WEBRTC_THREAD_RR" ]
-
     if (build_with_mozilla) {
       include_dirs = [
         "/config/external/nspr",
@@ -58,8 +56,6 @@ rtc_static_library("system_wrappers") {
   }
 
   if (is_linux) {
-    defines += [ "WEBRTC_THREAD_RR" ]
-
     if (!build_with_chromium) {
       deps += [ ":cpu_features_linux" ]
     }
@@ -67,10 +63,6 @@ rtc_static_library("system_wrappers") {
     libs += [ "rt" ]
   }
 
-  if (is_ios || is_mac) {
-    defines += [ "WEBRTC_THREAD_RR" ]
-  }
-
   if (is_win) {
     libs += [ "winmm.lib" ]