Index: sys/netinet/sctp_usrreq.c
===================================================================
--- sys/netinet/sctp_usrreq.c
+++ sys/netinet/sctp_usrreq.c
@@ -163,7 +163,10 @@
 					    chk->rec.data.tsn);
 				}
 				/* Clear any time so NO RTT is being done */
-				chk->do_rtt = 0;
+                                if (chk->do_rtt == 1){
+					chk->do_rtt = 0;
+					net->rto_needed = 1;
+                                }
 			}
 		}
 	}