diff --git a/utils.c b/utils.c
index e59002e..5d9d5aa 100644
--- a/utils.c
+++ b/utils.c
@@ -56,7 +56,7 @@ void *__calloc_a(size_t len, ...)
 	return ret;
 }
 
-#ifdef __APPLE__
+#ifdef LIBUBOX_COMPAT_CLOCK_GETTIME
 #include <mach/mach_host.h>		/* host_get_clock_service() */
 #include <mach/mach_port.h>		/* mach_port_deallocate() */
 #include <mach/mach_init.h>		/* mach_host_self(), mach_task_self() */
diff --git a/utils.h b/utils.h
index 803150b..cd09cc0 100644
--- a/utils.h
+++ b/utils.h
@@ -57,7 +57,8 @@ extern int __BUILD_BUG_ON_CONDITION_FAILED;
 #define BUILD_BUG_ON __BUILD_BUG_ON
 #endif
 
-#ifdef __APPLE__
+#if defined(__APPLE__) && !defined(CLOCK_MONOTONIC)
+#define LIBUBOX_COMPAT_CLOCK_GETTIME
 
 #include <mach/clock_types.h>
 #define CLOCK_REALTIME	CALENDAR_CLOCK