diff --git a/mud.c b/mud.c
index 03b6e7e..e93d4c1 100644
--- a/mud.c
+++ b/mud.c
@@ -1204,11 +1204,7 @@ mud_update_window(struct mud *mud, struct mud_path *path, uint64_t now,
                   uint64_t rx_dt, uint64_t rx_bytes, uint64_t rx_pkt)
 {
     if (rx_dt && rx_dt > tx_dt + (tx_dt >> 3)) {
-        if (!path->conf.fixed_rate) {
-            path->tx.rate = 1 + ((rx_bytes * MUD_ONE_SEC) - 1) / rx_dt;
-            if (path->tx.rate > path->conf.tx_max_rate)
-                path->tx.rate = path->conf.tx_max_rate;
-        }
+        path->tx.rate = (7 * rx_bytes * MUD_ONE_SEC) / (8 * rx_dt);
     } else {
         uint64_t tx_acc = path->msg.tx.acc + tx_pkt;
         uint64_t rx_acc = path->msg.rx.acc + rx_pkt;
@@ -1223,7 +1219,13 @@ mud_update_window(struct mud *mud, struct mud_path *path, uint64_t now,
             path->msg.tx.acc = tx_acc;
             path->msg.rx.acc = rx_acc;
         }
+
+        if (!path->conf.fixed_rate)
+            path->tx.rate += path->tx.rate / 10;
     }
+
+    if (path->tx.rate > path->conf.tx_max_rate)
+        path->tx.rate = path->conf.tx_max_rate;
 }
 
 static void