diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index ed7c9e30ebc963df397db4045a4e3ce5e5e03198..3cc629d3c9ff80593c24d128dfcdc729111b89dc 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -210,6 +210,9 @@ struct sctp_chunk *sctp_make_init(const struct sctp_association *asoc,
 	chunksize = sizeof(init) + addrs_len + SCTP_SAT_LEN(num_types);
 	chunksize += sizeof(ecap_param);
 
+	if (sctp_prsctp_enable)
+		chunksize += sizeof(prsctp_param);
+
 	/* ADDIP: Section 4.2.7:
 	 *  An implementation supporting this extension [ADDIP] MUST list
 	 *  the ASCONF,the ASCONF-ACK, and the AUTH  chunks in its INIT and
@@ -369,6 +372,9 @@ struct sctp_chunk *sctp_make_init_ack(const struct sctp_association *asoc,
 	if (asoc->peer.ecn_capable)
 		chunksize += sizeof(ecap_param);
 
+	if (sctp_prsctp_enable)
+		chunksize += sizeof(prsctp_param);
+
 	if (sctp_addip_enable) {
 		extensions[num_ext] = SCTP_CID_ASCONF;
 		extensions[num_ext+1] = SCTP_CID_ASCONF_ACK;