diff --git a/sys/contrib/ipfilter/netinet/ip_compat.h b/sys/contrib/ipfilter/netinet/ip_compat.h
index d0b26af2aa8e..e88ef88a6a40 100644
--- a/sys/contrib/ipfilter/netinet/ip_compat.h
+++ b/sys/contrib/ipfilter/netinet/ip_compat.h
@@ -33,10 +33,6 @@
 #endif
 
 #define	SOLARIS	(defined(sun) && (defined(__svr4__) || defined(__SVR4)))
-#if defined(__FreeBSD_version) && (__FreeBSD_version >= 400000) && \
-    !defined(_KERNEL) && !defined(USE_INET6) && !defined(NOINET6)
-# define	USE_INET6
-#endif
 
 
 #if defined(__SVR4) || defined(__svr4__) || defined(__sgi)