diff --git a/sys/netinet/sctp_pcb.c b/sys/netinet/sctp_pcb.c
index f3d477e2a9a..3665b8e2f21 100644
--- a/sys/netinet/sctp_pcb.c
+++ b/sys/netinet/sctp_pcb.c
@@ -248,17 +248,6 @@ sctp_free_ifn(struct sctp_ifn *sctp_ifnp)
 	}
 }
 
-void
-sctp_update_ifn_mtu(uint32_t ifn_index, uint32_t mtu)
-{
-	struct sctp_ifn *sctp_ifnp;
-
-	sctp_ifnp = sctp_find_ifn((void *)NULL, ifn_index);
-	if (sctp_ifnp != NULL) {
-		sctp_ifnp->ifn_mtu = mtu;
-	}
-}
-
 void
 sctp_free_ifa(struct sctp_ifa *sctp_ifap)
 {
diff --git a/sys/netinet/sctp_pcb.h b/sys/netinet/sctp_pcb.h
index ed6a1c34ccf..86c244c7154 100644
--- a/sys/netinet/sctp_pcb.h
+++ b/sys/netinet/sctp_pcb.h
@@ -506,8 +506,6 @@ sctp_add_addr_to_vrf(uint32_t vrfid,
     void *ifa, struct sockaddr *addr, uint32_t ifa_flags,
     int dynamic_add);
 
-void sctp_update_ifn_mtu(uint32_t ifn_index, uint32_t mtu);
-
 void sctp_free_ifa(struct sctp_ifa *sctp_ifap);
 
 void