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diff --git a/sys/netinet6/nd6_rtr.c b/sys/netinet6/nd6_rtr.c
--- a/sys/netinet6/nd6_rtr.c
+++ b/sys/netinet6/nd6_rtr.c
@@ -1567,6 +1567,16 @@
NET_EPOCH_ASSERT();
+ /*
+ * Address autoconfiguration based on Section 5.5.3 of RFC 4862.
+ * 5.5.3 (a). Ignore the prefix without the A bit set.
+ * 5.5.3 (b). the link-local prefix should have been ignored in nd6_ra_input.
+ * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
+ */
+ if (new->ndpr_raf_auto == 0 ||
+ new->ndpr_pltime > new->ndpr_vltime)
+ return;
+
/* check if prefix already exists on the same interface */
if ((pr = nd6_prefix_lookup(new)) != NULL)
nd6_prefix_update(new, pr);
@@ -1602,18 +1612,6 @@
if (dr != NULL)
pfxrtr_add(pr, dr);
- /*
- * Address autoconfiguration based on Section 5.5.3 of RFC 4862.
- * Note that pr must be non NULL at this point.
- *
- * 5.5.3 (a). Ignore the prefix without the A bit set.
- * 5.5.3 (b). the link-local prefix should have been ignored in nd6_ra_input.
- * 5.5.3 (c). Consistency check on lifetimes: pltime <= vltime.
- */
- if (new->ndpr_raf_auto == 0 ||
- new->ndpr_pltime > new->ndpr_vltime)
- goto end;
-
/*
* 5.5.3 (d). If the prefix advertised is not equal to the prefix of
* an address configured by stateless autoconfiguration already in the

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