diff --git a/sys/sys/cdefs.h b/sys/sys/cdefs.h
index 9456038746a9..b0d88f3f0bba 100644
--- a/sys/sys/cdefs.h
+++ b/sys/sys/cdefs.h
@@ -521,7 +521,7 @@
 #if _POSIX_C_SOURCE >= 200809
 #define	__POSIX_VISIBLE		200809
 #define	__ISO_C_VISIBLE		1999
-#elif _POSIX_C_SOURCE >= 200121
+#elif _POSIX_C_SOURCE >= 200112
 #define	__POSIX_VISIBLE		200112
 #define	__ISO_C_VISIBLE		1999
 #elif _POSIX_C_SOURCE >= 199506