diff --git a/service/src/main/java/com/github/kr328/clash/service/TunService.kt b/service/src/main/java/com/github/kr328/clash/service/TunService.kt
index 9765eb6..e1b7840 100644
--- a/service/src/main/java/com/github/kr328/clash/service/TunService.kt
+++ b/service/src/main/java/com/github/kr328/clash/service/TunService.kt
@@ -16,7 +16,7 @@ import kotlinx.coroutines.*
 class TunService : VpnService(), CoroutineScope by MainScope() {
     companion object {
         // from https://github.com/shadowsocks/shadowsocks-android/blob/master/core/src/main/java/com/github/shadowsocks/bg/VpnService.kt
-        private const val VPN_MTU = 9000
+        private const val VPN_MTU = 65535
         private const val PRIVATE_VLAN4_SUBNET = 30
         private const val PRIVATE_VLAN6_SUBNET = 126
         private const val PRIVATE_VLAN4_CLIENT = "172.31.255.253"