diff --git a/include/unistd.h b/include/unistd.h
index a3c6ace08d..4b2666a10e 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -65,6 +65,7 @@
 #define _POSIX_PRIORITIZED_IO _POSIX_VERSION
 #define _POSIX_CPUTIME _POSIX_VERSION
 #define _POSIX_THREAD_CPUTIME _POSIX_VERSION
+#define _POSIX_THREAD_PRIORITY_SCHEDULING _POSIX_VERSION
 
 #ifdef CONFIG_FS_AIO
 #  define _POSIX_ASYNCHRONOUS_IO _POSIX_VERSION