diff --git a/sys/compat/linux/linux.c b/sys/compat/linux/linux.c
--- a/sys/compat/linux/linux.c
+++ b/sys/compat/linux/linux.c
@@ -434,10 +434,17 @@
 unsigned short
 linux_ifflags(struct ifnet *ifp)
 {
-	unsigned short fl, flags;
+	unsigned short flags;
+
+	flags = if_getflags(ifp) | if_getdrvflags(ifp);
+	return (bsd_to_linux_ifflags(flags));
+}
+
+unsigned short
+bsd_to_linux_ifflags(int fl)
+{
+	unsigned short flags = 0;
 
-	fl = (if_getflags(ifp) | if_getdrvflags(ifp)) & 0xffff;
-	flags = 0;
 	if (fl & IFF_UP)
 		flags |= LINUX_IFF_UP;
 	if (fl & IFF_BROADCAST)
diff --git a/sys/compat/linux/linux_common.h b/sys/compat/linux/linux_common.h
--- a/sys/compat/linux/linux_common.h
+++ b/sys/compat/linux/linux_common.h
@@ -39,6 +39,7 @@
 unsigned short	linux_ifflags(struct ifnet *);
 int		linux_ifhwaddr(struct ifnet *ifp, struct l_sockaddr *lsa);
 
+unsigned short	bsd_to_linux_ifflags(int);
 int		linux_to_bsd_domain(int domain);
 int		bsd_to_linux_domain(int domain);
 int		bsd_to_linux_sockaddr(const struct sockaddr *sa,