diff --git a/rtc_base/critical_section.cc b/rtc_base/critical_section.cc
index 72a238f..2100fe9 100644
--- a/rtc_base/critical_section.cc
+++ b/rtc_base/critical_section.cc
@@ -34,6 +34,10 @@
   pthread_mutexattr_t mutex_attribute;
   pthread_mutexattr_init(&mutex_attribute);
   pthread_mutexattr_settype(&mutex_attribute, PTHREAD_MUTEX_RECURSIVE);
+#if defined(WEBRTC_MAC)
+  pthread_mutexattr_setpolicy_np(&mutex_attribute,
+                                 _PTHREAD_MUTEX_POLICY_FAIRSHARE);
+#endif
   pthread_mutex_init(&mutex_, &mutex_attribute);
   pthread_mutexattr_destroy(&mutex_attribute);
 #endif
diff --git a/rtc_base/critical_section.h b/rtc_base/critical_section.h
index a81fa0b..d575b97 100644
--- a/rtc_base/critical_section.h
+++ b/rtc_base/critical_section.h
@@ -34,7 +34,7 @@
 #endif
 
 // See notes in the 'Performance' unit test for the effects of this flag.
-#define USE_NATIVE_MUTEX_ON_MAC 0
+#define USE_NATIVE_MUTEX_ON_MAC 1
 
 #if defined(WEBRTC_MAC) && !USE_NATIVE_MUTEX_ON_MAC
 #include <dispatch/dispatch.h>
diff --git a/rtc_base/critical_section_unittest.cc b/rtc_base/critical_section_unittest.cc
index e988046..5405c61 100644
--- a/rtc_base/critical_section_unittest.cc
+++ b/rtc_base/critical_section_unittest.cc
@@ -372,25 +372,33 @@
   int my_id_ = 0;
 };
 
-// Comparison of output of this test as tested on a MacBook Pro Retina, 15-inch,
-// Mid 2014, 2,8 GHz Intel Core i7, 16 GB 1600 MHz DDR3,
-// running OS X El Capitan, 10.11.2.
+// Comparison of output of this test as tested on a MacBook Pro, 13-inch,
+// 2017, 3,5 GHz Intel Core i7, 16 GB 2133 MHz LPDDR3,
+// running macOS Mojave, 10.14.3.
 //
-// Native mutex implementation:
+// Native mutex implementation using fair policy (previously macOS default):
 // Approximate CPU usage:
-//   System: ~16%
-//   User mode: ~1.3%
-//   Idle: ~82%
+// real    4m54.612s
+// user    1m20.575s
+// sys     3m48.872s
 // Unit test output:
-// [       OK ] CriticalSectionTest.Performance (234545 ms)
+// [       OK ] CriticalSectionTest.Performance (294375 ms)
+//
+// Native mutex implementation using first fit policy (current macOS default):
+// Approximate CPU usage:
+// real    0m11.535s
+// user    0m12.738s
+// sys     0m31.207s
+// Unit test output:
+// [       OK ] CriticalSectionTest.Performance (11444 ms)
 //
 // Special partially spin lock based implementation:
 // Approximate CPU usage:
-//   System: ~75%
-//   User mode: ~16%
-//   Idle: ~8%
+// real    0m2.113s
+// user    0m3.014s
+// sys     0m4.495s
 // Unit test output:
-// [       OK ] CriticalSectionTest.Performance (2107 ms)
+// [       OK ] CriticalSectionTest.Performance (1885 ms)
 //
 // The test is disabled by default to avoid unecessarily loading the bots.
 TEST(CriticalSectionTest, DISABLED_Performance) {
diff --git a/rtc_base/platform_thread_types.h b/rtc_base/platform_thread_types.h
index 0bc42eb..6b9101e 100644
--- a/rtc_base/platform_thread_types.h
+++ b/rtc_base/platform_thread_types.h
@@ -25,6 +25,9 @@
 #elif defined(WEBRTC_POSIX)
 #include <pthread.h>
 #include <unistd.h>
+#if defined(WEBRTC_MAC)
+#include <pthread_spis.h>
+#endif
 #endif
 // clang-format on