diff --git a/scripts/down_ppp.rsc b/scripts/down_ppp.rsc
index b05bb71..5d2a50e 100644
--- a/scripts/down_ppp.rsc
+++ b/scripts/down_ppp.rsc
@@ -1,8 +1,8 @@
 :log debug "用户 $"remote-address" 下线"
 
 # 删除旧的分配规则
-:local "snat-address" [/ip/firewall/nat/get [find src-address $"remote-address"] to-addresses]
-/ip/firewall/nat/remove [find where src-address $"remote-address"]
+:local "snat-address" [/ip/firewall/nat/get [find comment~"snat $"remote-address""] to-addresses]
+/ip/firewall/nat/remove [find comment~"snat $"remote-address""]
 
 :log debug "删除旧的 nat 规则"
 
diff --git a/scripts/up_ppp.rsc b/scripts/up_ppp.rsc
index 9dd793c..dc616f0 100644
--- a/scripts/up_ppp.rsc
+++ b/scripts/up_ppp.rsc
@@ -1,7 +1,7 @@
 :log debug "用户 $"remote-address" 上线"
 
 # 删除旧的分配规则
-/ip/firewall/nat/remove [find where src-address $"remote-address"]
+/ip/firewall/nat/remove [find comment~"snat $"remote-address""]
 
 :log debug "删除旧的 nat 规则"