diff --git a/core/src/main/jni/shadowsocks-libev b/core/src/main/jni/shadowsocks-libev
index 6040be9d..1a219895 160000
--- a/core/src/main/jni/shadowsocks-libev
+++ b/core/src/main/jni/shadowsocks-libev
@@ -1 +1 @@
-Subproject commit 6040be9d0af812382934defe317c2e28434494ad
+Subproject commit 1a21989566e778139c489d5f8972979bda9b16c1
diff --git a/mobile/src/main/java/com/github/shadowsocks/bg/TrafficMonitorThread.kt b/mobile/src/main/java/com/github/shadowsocks/bg/TrafficMonitorThread.kt
index 5d738208..62025554 100644
--- a/mobile/src/main/java/com/github/shadowsocks/bg/TrafficMonitorThread.kt
+++ b/mobile/src/main/java/com/github/shadowsocks/bg/TrafficMonitorThread.kt
@@ -37,7 +37,6 @@ class TrafficMonitorThread : LocalSocketListener("TrafficMonitorThread") {
             if (socket.inputStream.read(buffer) != 16) throw IOException("Unexpected traffic stat length")
             val stat = ByteBuffer.wrap(buffer).order(ByteOrder.LITTLE_ENDIAN)
             TrafficMonitor.update(stat.getLong(0), stat.getLong(8))
-            socket.outputStream.write(0)
         } catch (e: IOException) {
             Log.e(tag, "Error when recv traffic stat", e)
             app.track(e)