diff --git a/include/unistd.h b/include/unistd.h
index b5a302afbb..62e505ad3c 100644
--- a/include/unistd.h
+++ b/include/unistd.h
@@ -55,7 +55,12 @@
 #undef  _POSIX_MAPPED_FILES
 #undef  _POSIX_SHARED_MEMORY_OBJECTS
 #define _POSIX_PRIORITY_SCHEDULING 1
-#define _POSIX_TIMERS 1
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+#  define _POSIX_TIMERS 1
+#endif
+#if !defined(CONFIG_DISABLE_MQUEUE) && !defined(CONFIG_DISABLE_PTHREAD)
+#  define _POSIX_TIMEOUTS 1
+#endif
 #undef  _POSIX_MEMLOCK
 #undef  _POSIX_MEMLOCK_RANGE
 #undef  _POSIX_FSYNC