diff --git a/sysdeps/mach/sleep.c b/sysdeps/mach/sleep.c
index b30ec7b1d6..267928e1e4 100644
--- a/sysdeps/mach/sleep.c
+++ b/sysdeps/mach/sleep.c
@@ -33,10 +33,10 @@ __sleep (unsigned int seconds)
 
   recv = __mach_reply_port ();
 
-  before = time (NULL);
+  before = time_now ();
   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
 		     0, 0, recv, seconds * 1000, MACH_PORT_NULL);
-  after = time (NULL);
+  after = time_now ();
   __mach_port_destroy (__mach_task_self (), recv);
 
   return seconds - (after - before);