diff --git a/DWeChatRobot/ReceiveMessage.cpp b/DWeChatRobot/ReceiveMessage.cpp
index e512d776942ea562136499dc49d35dca5400ba85..90c2d2c730f875e30cce74225a8c61c3fbfcecb9 100644
--- a/DWeChatRobot/ReceiveMessage.cpp
+++ b/DWeChatRobot/ReceiveMessage.cpp
@@ -249,7 +249,7 @@ void OnUpdateMessage(DWORD messageAddr)
 void OnVoipAckMessage(DWORD messageAddr)
 {
     DWORD type = *(DWORD *)(messageAddr + 0x38);
-    if (type == 0x32 || type == 0x33)
+    if (type == 0x32 || type == 0x33 || type == 0x2712)
         dealMessage(messageAddr, MSG_SYNC);
 }