diff --git a/ip_manager/throttle.go b/ip_manager/throttle.go
index 17c3da9..7ecfbbd 100644
--- a/ip_manager/throttle.go
+++ b/ip_manager/throttle.go
@@ -130,7 +130,6 @@ func (i *IPPool) ReleaseAll() {
 		}
 		localIP := &i.ips[j]
 		localIP.InUse = false
-		localIP.LastUse = time.Now()
 	}
 }