diff --git a/sys/net/bpf.c b/sys/net/bpf.c
index a04fdef..065e1e3 100644
--- a/sys/net/bpf.c
+++ b/sys/net/bpf.c
@@ -69,7 +69,6 @@ __FBSDID("$FreeBSD$");
 
 #include <net/if.h>
 #include <net/if_var.h>
-#define	BPF_INTERNAL
 #include <net/bpf.h>
 #include <net/bpf_buffer.h>
 #ifdef BPF_JITTER
@@ -90,6 +89,20 @@ __FBSDID("$FreeBSD$");
 
 MALLOC_DEFINE(M_BPF, "BPF", "BPF data");
 
+struct bpf_if {
+#define	bif_next	bif_ext.bif_next
+#define	bif_dlist	bif_ext.bif_dlist
+	struct bpf_if_ext bif_ext;	/* public members */
+	u_int		bif_dlt;	/* link layer type */
+	u_int		bif_hdrlen;	/* length of link header */
+	struct ifnet	*bif_ifp;	/* corresponding interface */
+	struct rwlock	bif_lock;	/* interface lock */
+	LIST_HEAD(, bpf_d) bif_wlist;	/* writer-only list */
+	int		bif_flags;	/* Interface flags */
+};
+
+CTASSERT(offsetof(struct bpf_if, bif_ext) == 0);
+
 #if defined(DEV_BPF) || defined(NETGRAPH_BPF)
 
 #define PRINET  26			/* interruptible */
@@ -1890,7 +1903,7 @@ bpf_setif(struct bpf_d *d, struct ifreq *ifr)
 
 	/* Check if interface is not being detached from BPF */
 	BPFIF_RLOCK(bp);
-	if (bp->flags & BPFIF_FLAG_DYING) {
+	if (bp->bif_flags & BPFIF_FLAG_DYING) {
 		BPFIF_RUNLOCK(bp);
 		return (ENXIO);
 	}
@@ -2559,7 +2572,7 @@ bpfdetach(struct ifnet *ifp)
 		 * Mark bp as detached to restrict new consumers.
 		 */
 		BPFIF_WLOCK(bp);
-		bp->flags |= BPFIF_FLAG_DYING;
+		bp->bif_flags |= BPFIF_FLAG_DYING;
 		BPFIF_WUNLOCK(bp);
 
 		CTR4(KTR_NET, "%s: sheduling free for encap %d (%p) for if %p",
diff --git a/sys/net/bpf.h b/sys/net/bpf.h
index 47cbb87..df326e6 100644
--- a/sys/net/bpf.h
+++ b/sys/net/bpf.h
@@ -1451,21 +1451,14 @@ SYSCTL_DECL(_net_bpf);
 
 /*
  * Descriptor associated with each attached hardware interface.
- * FIXME: this structure is exposed to external callers to speed up
- * bpf_peers_present() call. However we cover all fields not needed by
- * this function via BPF_INTERNAL define
+ * Part of this structure is exposed to external callers to speed up
+ * bpf_peers_present() calls.
  */
-struct bpf_if {
+struct bpf_if;
+
+struct bpf_if_ext {
 	LIST_ENTRY(bpf_if)	bif_next;	/* list of all interfaces */
 	LIST_HEAD(, bpf_d)	bif_dlist;	/* descriptor list */
-#ifdef BPF_INTERNAL
-	u_int bif_dlt;				/* link layer type */
-	u_int bif_hdrlen;		/* length of link header */
-	struct ifnet *bif_ifp;		/* corresponding interface */
-	struct rwlock bif_lock;		/* interface lock */
-	LIST_HEAD(, bpf_d)	bif_wlist;	/* writer-only list */
-	int flags;			/* Interface flags */
-#endif
 };
 
 void	 bpf_bufheld(struct bpf_d *d);
@@ -1483,8 +1476,10 @@ u_int	 bpf_filter(const struct bpf_insn *, u_char *, u_int, u_int);
 static __inline int
 bpf_peers_present(struct bpf_if *bpf)
 {
+	struct bpf_if_ext *ext;
 
-	if (!LIST_EMPTY(&bpf->bif_dlist))
+	ext = (struct bpf_if_ext *)bpf;
+	if (!LIST_EMPTY(&ext->bif_dlist))
 		return (1);
 	return (0);
 }