diff --git a/rtc_base/critical_section.cc b/rtc_base/critical_section.cc
index 4fad961209..c6b17ff1b2 100644
--- a/rtc_base/critical_section.cc
+++ b/rtc_base/critical_section.cc
@@ -43,7 +43,7 @@ CriticalSection::CriticalSection() {
   pthread_mutexattr_settype(&mutex_attribute, PTHREAD_MUTEX_RECURSIVE);
 #if defined(WEBRTC_MAC)
   pthread_mutexattr_setpolicy_np(&mutex_attribute,
-                                 _PTHREAD_MUTEX_POLICY_FAIRSHARE);
+                                 _PTHREAD_MUTEX_POLICY_FIRSTFIT);
 #endif
   pthread_mutex_init(&mutex_, &mutex_attribute);
   pthread_mutexattr_destroy(&mutex_attribute);
diff --git a/rtc_base/synchronization/mutex_pthread.h b/rtc_base/synchronization/mutex_pthread.h
index c3d9a7aff0..c9496e72c9 100644
--- a/rtc_base/synchronization/mutex_pthread.h
+++ b/rtc_base/synchronization/mutex_pthread.h
@@ -29,7 +29,7 @@ class RTC_LOCKABLE MutexImpl final {
     pthread_mutexattr_init(&mutex_attribute);
 #if defined(WEBRTC_MAC)
     pthread_mutexattr_setpolicy_np(&mutex_attribute,
-                                   _PTHREAD_MUTEX_POLICY_FAIRSHARE);
+                                   _PTHREAD_MUTEX_POLICY_FIRSTFIT);
 #endif
     pthread_mutex_init(&mutex_, &mutex_attribute);
     pthread_mutexattr_destroy(&mutex_attribute);