diff --git a/sys/sys/utsname.h b/sys/sys/utsname.h
index 410e065..0ca5387 100644
--- a/sys/sys/utsname.h
+++ b/sys/sys/utsname.h
@@ -36,7 +36,7 @@
 #ifndef        _SYS_UTSNAME_H
 #define        _SYS_UTSNAME_H

-#ifdef _KERNEL
+#if defined(_KERNEL) && defined(COMPAT_FREEBSD4)
 #define        SYS_NMLN        32              /* uname(2) for the FreeBSD 1.1 ABI. */
 #endif