*   The INIT ACK chunk is used to acknowledge the initiation of an SCTP
  *   association.
  */
-typedef struct sctp_init_chunk sctp_initack_chunk_t;
+struct sctp_initack_chunk {
+       struct sctp_chunkhdr chunk_hdr;
+       struct sctp_inithdr init_hdr;
+};
 
 /* Section 3.3.3.1 State Cookie (7) */
 typedef struct sctp_cookie_param {
 
                return sctp_sf_violation_chunk(net, ep, asoc, type, arg, commands);
 
        /* Make sure that the INIT-ACK chunk has a valid length */
-       if (!sctp_chunk_length_valid(chunk, sizeof(sctp_initack_chunk_t)))
+       if (!sctp_chunk_length_valid(chunk, sizeof(struct sctp_initack_chunk)))
                return sctp_sf_violation_chunklen(net, ep, asoc, type, arg,
                                                  commands);
        /* Grab the INIT header.  */
                /* Treat INIT-ACK as a special case during COOKIE-WAIT. */
                if (chunk->chunk_hdr->type == SCTP_CID_INIT_ACK &&
                    !asoc->peer.i.init_tag) {
-                       sctp_initack_chunk_t *initack;
+                       struct sctp_initack_chunk *initack;
 
-                       initack = (sctp_initack_chunk_t *)chunk->chunk_hdr;
-                       if (!sctp_chunk_length_valid(chunk,
-                                                    sizeof(sctp_initack_chunk_t)))
+                       initack = (struct sctp_initack_chunk *)chunk->chunk_hdr;
+                       if (!sctp_chunk_length_valid(chunk, sizeof(*initack)))
                                abort->chunk_hdr->flags |= SCTP_CHUNK_FLAG_T;
                        else {
                                unsigned int inittag;
                switch (chunk->chunk_hdr->type) {
                case SCTP_CID_INIT_ACK:
                {
-                       sctp_initack_chunk_t *initack;
+                       struct sctp_initack_chunk *initack;
 
-                       initack = (sctp_initack_chunk_t *)chunk->chunk_hdr;
+                       initack = (struct sctp_initack_chunk *)chunk->chunk_hdr;
                        vtag = ntohl(initack->init_hdr.init_tag);
                        break;
                }