diff --git a/coio.c b/coio.c
index 004ee58..d936e0c 100644
--- a/coio.c
+++ b/coio.c
@@ -19,6 +19,11 @@
 #include "coioimpl.h"
 #include "coro.h"
 
+#if defined(__APPLE__)
+#include <mach/clock.h>
+#include <mach/mach.h>
+#endif
+
 static coro_context _sched_ctx;
 static unsigned long _taskcount = 0;
 
@@ -219,10 +224,21 @@ coio_transfer()
 uvlong
 coio_now()
 {
+#if defined(__APPLE__)
+	clock_serv_t cclock;
+	mach_timespec_t mts;
+
+	host_get_clock_service(mach_host_self(), SYSTEM_CLOCK, &cclock);
+	clock_get_time(cclock, &mts);
+	mach_port_deallocate(mach_task_self(), cclock);
+
+	return (uvlong) mts.tv_sec * 1000 * 1000 * 1000 + mts.tv_nsec;
+#else
 	struct timespec ts;
 
 	if (clock_gettime(CLOCK_MONOTONIC, &ts) < 0)
 		return -1;
 
 	return (uvlong) ts.tv_sec * 1000 * 1000 * 1000 + ts.tv_nsec;
+#endif
 }
diff --git a/coro.c b/coro.c
index ff71383..d37b28d 100644
--- a/coro.c
+++ b/coro.c
@@ -123,7 +123,7 @@ trampoline (int sig)
 
   asm (
        "\t.text\n"
-       #if _WIN32 || __CYGWIN__
+       #if _WIN32 || __CYGWIN__ || __APPLE__
        "\t.globl _coro_transfer\n"
        "_coro_transfer:\n"
        #else
diff --git a/coro.h b/coro.h
index 9f07c2d..3b08b81 100644
--- a/coro.h
+++ b/coro.h
@@ -303,7 +303,7 @@ void coro_stack_free (struct coro_stack *stack);
 #  define CORO_ASM 1
 # elif defined WINDOWS || defined _WIN32
 #  define CORO_LOSER 1 /* you don't win with windoze */
-# elif (__linux || __OpenBSD__) && (__i386 || (__x86_64 && !__ILP32))
+# elif (__linux || __OpenBSD__ || __APPLE__) && (__i386 || (__x86_64 && !__ILP32))
 #  define CORO_ASM 1
 # elif defined HAVE_UCONTEXT_H
 #  define CORO_UCONTEXT 1