Index: net/if_loop.c
===================================================================
--- net/if_loop.c	(revision 279507)
+++ net/if_loop.c	(working copy)
@@ -241,7 +241,7 @@
 	ifp->if_obytes += m->m_pkthdr.len;
 
 	/* BPF writes need to be handled specially. */
-	if (dst->sa_family == AF_UNSPEC)
+	if (dst->sa_family == AF_UNSPEC || dst->sa_family == pseudo_AF_HDRCMPLT)
 		bcopy(dst->sa_data, &af, sizeof(af));
 	else
 		af = dst->sa_family;