diff --git a/sys/netinet6/nd6_rtr.c b/sys/netinet6/nd6_rtr.c
index 9d1f0d6e8cbb..4ec64fbadbd2 100644
--- a/sys/netinet6/nd6_rtr.c
+++ b/sys/netinet6/nd6_rtr.c
@@ -1415,6 +1415,9 @@ pfxlist_onlink_check()
 			if (pr->ndpr_raf_onlink == 0)
 				continue;
 
+			if (pr->ndpr_raf_auto == 0)
+				continue;
+
 			if ((pr->ndpr_stateflags & NDPRF_DETACHED) == 0 &&
 			    find_pfxlist_reachable_router(pr) == NULL)
 				pr->ndpr_stateflags |= NDPRF_DETACHED;
@@ -1431,6 +1434,9 @@ pfxlist_onlink_check()
 			if (pr->ndpr_raf_onlink == 0)
 				continue;
 
+			if (pr->ndpr_raf_auto == 0)
+				continue;
+
 			if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0)
 				pr->ndpr_stateflags &= ~NDPRF_DETACHED;
 		}
@@ -1454,6 +1460,9 @@ pfxlist_onlink_check()
 		if (pr->ndpr_raf_onlink == 0)
 			continue;
 
+		if (pr->ndpr_raf_auto == 0)
+			continue;
+
 		if ((pr->ndpr_stateflags & NDPRF_DETACHED) != 0 &&
 		    (pr->ndpr_stateflags & NDPRF_ONLINK) != 0) {
 			if ((e = nd6_prefix_offlink(pr)) != 0) {