diff --git a/src/platforms/px4_time.h b/src/platforms/px4_time.h
index 548f58abd8..d25396ae28 100644
--- a/src/platforms/px4_time.h
+++ b/src/platforms/px4_time.h
@@ -5,19 +5,11 @@
 #include <pthread.h>
 
 #if defined(__PX4_APPLE_LEGACY)
-
-__BEGIN_DECLS
-
+// TODO: check if this is required
 #define clockid_t unsigned
+#endif
 
-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)
+#if defined(__PX4_QURT)
 
 #include <sys/timespec.h>
 
@@ -32,17 +24,6 @@ __END_DECLS
 
 #else
 
-
-#if 0
-#define px4_clock_gettime clock_gettime
-#define px4_clock_settime clock_settime
-
-#define px4_usleep system_usleep
-#define px4_sleep system_sleep
-#define px4_pthread_cond_timedwait system_pthread_cond_timedwait
-#else
-
-
 __BEGIN_DECLS
 __EXPORT int px4_clock_gettime(clockid_t clk_id, struct timespec *tp);
 __EXPORT int px4_clock_settime(clockid_t clk_id, const struct timespec *tp);
@@ -53,8 +34,5 @@ __EXPORT int px4_pthread_cond_timedwait(pthread_cond_t *cond,
 					pthread_mutex_t *mutex,
 					const struct timespec *abstime);
 __END_DECLS
-#endif
-
-
 
 #endif