diff --git a/ikcp.c b/ikcp.c
index 246b08c..aac14bf 100644
--- a/ikcp.c
+++ b/ikcp.c
@@ -882,7 +882,13 @@ int ikcp_input(ikcpcb *kcp, const char *data, long size)
 				if (kcp->incr < mss) kcp->incr = mss;
 				kcp->incr += (mss * mss) / kcp->incr + (mss / 16);
 				if ((kcp->cwnd + 1) * mss <= kcp->incr) {
+				#if 1
+					kcp->cwnd = (kcp->incr + mss - 1) / ((mss > 0)? mss : 1);
+				#else
 					kcp->cwnd++;
+				#endif
+					}	else {
+					}
 				}
 			}
 			if (kcp->cwnd > kcp->rmt_wnd) {