diff --git a/src/clock.cpp b/src/clock.cpp
index 97e94fb0..5701d88d 100644
--- a/src/clock.cpp
+++ b/src/clock.cpp
@@ -42,6 +42,28 @@
 #include <time.h>
 #endif
 
+#if defined ZMQ_HAVE_OSX
+#include <mach/clock.h>
+#include <mach/mach.h>
+#include <time.h>
+#include <sys/time.h>
+
+int clock_gettime (int clock_id, timespec *ts)
+{
+    // The clock_id specified is not supported on this system.
+    if (clock_id != CLOCK_REALTIME)
+        return EINVAL;
+
+    clock_serv_t cclock;
+    mach_timespec_t mts;
+    host_get_clock_service (mach_host_self (), CALENDAR_CLOCK, &cclock);
+    clock_get_time (cclock, &mts);
+    mach_port_deallocate (mach_task_self (), cclock);
+    ts->tv_sec = mts.tv_sec;
+    ts->tv_nsec = mts.tv_nsec;
+}
+#endif
+
 #ifdef ZMQ_HAVE_WINDOWS
 typedef ULONGLONG (*f_compatible_get_tick_count64)();
 
diff --git a/src/clock.hpp b/src/clock.hpp
index 4db695f7..e7eeb900 100644
--- a/src/clock.hpp
+++ b/src/clock.hpp
@@ -22,6 +22,16 @@
 
 #include "stdint.hpp"
 
+#if defined ZMQ_HAVE_OSX
+#include <mach/clock.h>
+#include <mach/mach.h>
+#include <time.h>
+#include <sys/time.h>
+int clock_gettime (int clock_id, timespec *ts);
+#define CLOCK_REALTIME 0
+#define HAVE_CLOCK_GETTIME
+#endif
+
 namespace zmq
 {
 
diff --git a/src/condition_variable.hpp b/src/condition_variable.hpp
index 265bc9cc..e6c6c52b 100644
--- a/src/condition_variable.hpp
+++ b/src/condition_variable.hpp
@@ -21,6 +21,7 @@
 #define __ZMQ_CONDITON_VARIABLE_HPP_INCLUDED__
 
 #include "platform.hpp"
+#include "clock.hpp"
 #include "err.hpp"
 #include "mutex.hpp"
 
diff --git a/src/mailbox_safe.cpp b/src/mailbox_safe.cpp
index df0e191d..9aa73766 100644
--- a/src/mailbox_safe.cpp
+++ b/src/mailbox_safe.cpp
@@ -18,6 +18,7 @@
 */
 
 #include "mailbox_safe.hpp"
+#include "clock.hpp"
 #include "err.hpp"
 
 zmq::mailbox_safe_t::mailbox_safe_t (mutex_t* sync_) :