diff --git a/ip/ipprefix.c b/ip/ipprefix.c
index cb1f5822..d8327beb 100644
--- a/ip/ipprefix.c
+++ b/ip/ipprefix.c
@@ -92,7 +92,7 @@ int print_prefix(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
 
 	if (tb[PREFIX_CACHEINFO]) {
 		struct prefix_cacheinfo *pc;
-		pc = (struct prefix_cacheinfo *)tb[PREFIX_CACHEINFO];
+		pc = (struct prefix_cacheinfo *)RTA_DATA(tb[PREFIX_CACHEINFO]);
 
 		fprintf(fp, "valid %u ", pc->valid_time);
 		fprintf(fp, "preferred %u ", pc->preferred_time);