diff --git a/include/rabit/timer.h b/include/rabit/timer.h
index 51ece4a89..eaada7ef4 100644
--- a/include/rabit/timer.h
+++ b/include/rabit/timer.h
@@ -3,9 +3,13 @@
  * \brief This file defines the utils for timing
  * \author Tianqi Chen, Nacho, Tianyi
  */
-#ifndef RABIT_TIMER_H
-#define RABIT_TIMER_H
+#ifndef RABIT_TIMER_H_
+#define RABIT_TIMER_H_
 #include <time.h>
+#ifdef __MACH__
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
 #include "./utils.h"
 
 namespace rabit {
@@ -14,10 +18,19 @@ namespace utils {
  * \brief return time in seconds, not cross platform, avoid to use this in most places
  */
 inline double GetTime(void) {
+  #ifdef __MACH__ 
+  clock_serv_t cclock;
+  mach_timespec_t mts;
+  host_get_clock_service(mach_host_self(), CALENDAR_CLOCK, &cclock);
+  utils::Check(clock_get_time(cclock, &mts) == 0, "failed to get time");
+  mach_port_deallocate(mach_task_self(), cclock);
+  return static_cast<double>(mts.tv_sec) + static_cast<double>(mts.tv_nsec) * 1e-9;
+  #else
   timespec ts;
   utils::Check(clock_gettime(CLOCK_REALTIME, &ts) == 0, "failed to get time");
   return static_cast<double>(ts.tv_sec) + static_cast<double>(ts.tv_nsec) * 1e-9;
+  #endif
 }
-}
-}
-#endif
+}  // namespace utils
+}  // namespace rabit
+#endif  // RABIT_TIMER_H_