diff --git a/src/platforms/posix/px4_layer/drv_hrt.c b/src/platforms/posix/px4_layer/drv_hrt.c
index 70a9c5f02d..7cedbd0e7c 100644
--- a/src/platforms/posix/px4_layer/drv_hrt.c
+++ b/src/platforms/posix/px4_layer/drv_hrt.c
@@ -93,37 +93,7 @@ static void hrt_unlock(void)
 	px4_sem_post(&_hrt_lock);
 }
 
-#if (defined(__APPLE__) && defined(__MACH__))
-#include <time.h>
-#include <sys/time.h>
-#define CLOCK_REALTIME 0
-
-#ifndef CLOCK_MONOTONIC
-#define CLOCK_MONOTONIC 1
-#endif
-
-int px4_clock_gettime(clockid_t clk_id, struct timespec *tp)
-{
-	struct timeval now;
-	int rv = gettimeofday(&now, NULL);
-
-	if (rv) {
-		return rv;
-	}
-
-	tp->tv_sec = now.tv_sec;
-	tp->tv_nsec = now.tv_usec * 1000;
-
-	return 0;
-}
-
-int px4_clock_settime(clockid_t clk_id, struct timespec *tp)
-{
-	/* do nothing right now */
-	return 0;
-}
-
-#elif defined(__QURT)
+#if defined(__QURT)
 
 #include "dspal_time.h"
 
diff --git a/src/platforms/px4_time.h b/src/platforms/px4_time.h
index d57f8e9103..a3bcc90605 100644
--- a/src/platforms/px4_time.h
+++ b/src/platforms/px4_time.h
@@ -3,39 +3,17 @@
 #include <sys/types.h>
 #include <time.h>
 
-#if defined(__PX4_LINUX) || defined(__PX4_NUTTX)
+#if defined(__PX4_LINUX) || defined(__PX4_NUTTX) || defined(__PX4_DARWIN)
 
 #define px4_clock_gettime clock_gettime
 #define px4_clock_settime clock_settime
 
-#elif defined(__PX4_DARWIN)
-
-__BEGIN_DECLS
-
-#define clockid_t unsigned
-#define CLOCK_REALTIME 0
-
-int px4_clock_gettime(clockid_t clk_id, struct timespec *tp);
-int px4_clock_settime(clockid_t clk_id, struct timespec *tp);
-
-__EXPORT unsigned int sleep(unsigned int sec);
-
-__END_DECLS
-
 #elif defined(__PX4_QURT)
 
 #include <sys/timespec.h>
 
 __BEGIN_DECLS
 
-#if 0
-#if !defined(__cplusplus)
-struct timespec {
-	time_t tv_sec;
-	long tv_nsec;
-};
-#endif
-#endif
 int px4_clock_gettime(clockid_t clk_id, struct timespec *tp);
 int px4_clock_settime(clockid_t clk_id, struct timespec *tp);