diff --git a/sys/netpfil/pf/pf_ioctl.c b/sys/netpfil/pf/pf_ioctl.c
index ea71664756d7..c32a961f5a0b 100644
--- a/sys/netpfil/pf/pf_ioctl.c
+++ b/sys/netpfil/pf/pf_ioctl.c
@@ -1623,7 +1623,7 @@ pf_rule_to_krule(const struct pf_rule *rule, struct pf_krule *krule)
 	/* Don't allow userspace to set evaulations, packets or bytes. */
 	/* kif, anchor, overload_tbl are not copied over. */
 
-	krule->os_fingerprint = krule->os_fingerprint;
+	krule->os_fingerprint = rule->os_fingerprint;
 
 	krule->rtableid = rule->rtableid;
 	bcopy(rule->timeout, krule->timeout, sizeof(krule->timeout));