diff --git a/newlib/libc/include/sys/features.h b/newlib/libc/include/sys/features.h
index dbc4ebefa..93635ba6d 100644
--- a/newlib/libc/include/sys/features.h
+++ b/newlib/libc/include/sys/features.h
@@ -328,6 +328,7 @@ extern "C" {
 #define _POSIX_MEMORY_PROTECTION	1
 #define _POSIX_MESSAGE_PASSING		1
 #define _POSIX_MONOTONIC_CLOCK		200112L
+#define _POSIX_CLOCK_SELECTION		200112L
 #define _POSIX_PRIORITIZED_IO		1
 #define _POSIX_PRIORITY_SCHEDULING	1
 #define _POSIX_REALTIME_SIGNALS		1