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diff --git a/sys/net/bpf.c b/sys/net/bpf.c
index 657a34827bdb..a7d17109ed1a 100644
--- a/sys/net/bpf.c
+++ b/sys/net/bpf.c
@@ -2090,10 +2090,20 @@ bpf_setif(struct bpf_d *d, struct ifreq *ifr)
BPF_LOCK_ASSERT();
theywant = ifunit(ifr->ifr_name);
- if (theywant == NULL || theywant->if_bpf == NULL)
+ if (theywant == NULL)
+ return (ENXIO);
+ /*
+ * Look through attached interfaces for the named one.
+ */
+ CK_LIST_FOREACH(bp, &bpf_iflist, bif_next) {
+ if (bp->bif_ifp == theywant &&
+ bp->bif_bpf == &theywant->if_bpf)
+ break;
+ }
+ if (bp == NULL)
return (ENXIO);
- bp = theywant->if_bpf;
+ MPASS(bp == theywant->if_bpf);
/*
* At this point, we expect the buffer is already allocated. If not,
* return an error.
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