diff --git a/sys/netinet/sctp_usrreq.c b/sys/netinet/sctp_usrreq.c
index 79109373dbf..35a48ecffdc 100644
--- a/sys/netinet/sctp_usrreq.c
+++ b/sys/netinet/sctp_usrreq.c
@@ -1128,10 +1128,10 @@ sctp_fill_up_addresses_vrf(struct sctp_inpcb *inp,
 							actual += sizeof(struct sockaddr_in6);
 						} else {
 #endif
-							memcpy(sas, sin, sizeof(*sin));
+							memcpy(sas, sin, sizeof(struct sockaddr_in));
 							((struct sockaddr_in *)sas)->sin_port = inp->sctp_lport;
-							sas = (struct sockaddr_storage *)((caddr_t)sas + sizeof(*sin));
-							actual += sizeof(*sin);
+							sas = (struct sockaddr_storage *)((caddr_t)sas + sizeof(struct sockaddr_in));
+							actual += sizeof(struct sockaddr_in);
 #ifdef INET6
 						}
 #endif
@@ -1182,10 +1182,10 @@ sctp_fill_up_addresses_vrf(struct sctp_inpcb *inp,
 						    (IN6_IS_ADDR_SITELOCAL(&sin6->sin6_addr))) {
 							continue;
 						}
-						memcpy(sas, sin6, sizeof(*sin6));
+						memcpy(sas, sin6, sizeof(struct sockaddr_in6));
 						((struct sockaddr_in6 *)sas)->sin6_port = inp->sctp_lport;
-						sas = (struct sockaddr_storage *)((caddr_t)sas + sizeof(*sin6));
-						actual += sizeof(*sin6);
+						sas = (struct sockaddr_storage *)((caddr_t)sas + sizeof(struct sockaddr_in6));
+						actual += sizeof(struct sockaddr_in6);
 						if (actual >= limit) {
 							return (actual);
 						}