diff --git a/sys/include/byteorder.h b/sys/include/byteorder.h
index 4683bc7e89..4e401fa17d 100644
--- a/sys/include/byteorder.h
+++ b/sys/include/byteorder.h
@@ -23,10 +23,6 @@
 #include <stdint.h>
 #include "unaligned.h"
 
-#if defined(__MACH__)
-#   include "clang_compat.h"
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/sys/posix/pthread/include/pthread_cond.h b/sys/posix/pthread/include/pthread_cond.h
index b1ce753abe..342776b773 100644
--- a/sys/posix/pthread/include/pthread_cond.h
+++ b/sys/posix/pthread/include/pthread_cond.h
@@ -26,14 +26,6 @@
 #   include <sys/types.h>
 #endif
 
-#ifdef __MACH__
-/* needed for AVAILABLE_MAC_OS_X_VERSION_10_12_AND_LATER */
-#include <AvailabilityMacros.h>
-#if !defined(AVAILABLE_MAC_OS_X_VERSION_10_12_AND_LATER)
-typedef int clockid_t;
-#endif
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif