diff --git a/sys/net/bpf.c b/sys/net/bpf.c
--- a/sys/net/bpf.c
+++ b/sys/net/bpf.c
@@ -100,7 +100,7 @@
 
 MALLOC_DEFINE(M_BPF, "BPF", "BPF data");
 
-static struct bpf_if_ext dead_bpf_if = {
+static const struct bpf_if_ext dead_bpf_if = {
 	.bif_dlist = CK_LIST_HEAD_INITIALIZER()
 };
 
@@ -2859,7 +2859,7 @@
 			continue;
 
 		CK_LIST_REMOVE(bp, bif_next);
-		*bp->bif_bpf = (struct bpf_if *)&dead_bpf_if;
+		*bp->bif_bpf = __DECONST(struct bpf_if *, &dead_bpf_if);
 
 		CTR4(KTR_NET,
 		    "%s: sheduling free for encap %d (%p) for if %p",
@@ -3162,7 +3162,7 @@
 bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen, struct bpf_if **driverp)
 {
 
-	*driverp = (struct bpf_if *)&dead_bpf_if;
+	*driverp = __DECONST(struct bpf_if *, &dead_bpf_if);
 }
 
 void