diff --git a/src/unix/thread.c b/src/unix/thread.c
index 8d15c9b6..4fd5d2f5 100644
--- a/src/unix/thread.c
+++ b/src/unix/thread.c
@@ -323,6 +323,31 @@ void uv_cond_wait(uv_cond_t* cond, uv_mutex_t* mutex) {
     abort();
 }
 
+#if defined(__APPLE__) && defined(__MACH__)
+
+int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, uint64_t timeout) {
+  int r;
+  struct timeval tv;
+  struct timespec ts;
+  uint64_t abstime;
+
+  gettimeofday(&tv, NULL);
+  abstime = tv.tv_sec * 1e9 + tv.tv_usec * 1e3 + timeout;
+  ts.tv_sec = abstime / NANOSEC;
+  ts.tv_nsec = abstime % NANOSEC;
+  r = pthread_cond_timedwait(cond, mutex, &ts);
+
+  if (r == 0)
+    return 0;
+
+  if (r == ETIMEDOUT)
+    return -1;
+
+  abort();
+  return -1; /* Satisfy the compiler. */
+}
+
+#else /* !(defined(__APPLE__) && defined(__MACH__)) */
 
 int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, uint64_t timeout) {
   int r;
@@ -344,6 +369,8 @@ int uv_cond_timedwait(uv_cond_t* cond, uv_mutex_t* mutex, uint64_t timeout) {
   return -1; /* Satisfy the compiler. */
 }
 
+#endif /* defined(__APPLE__) && defined(__MACH__) */
+
 
 #if defined(__APPLE__) && defined(__MACH__)