diff --git a/kernel/extended/liteipc/hm_liteipc.c b/kernel/extended/liteipc/hm_liteipc.c
index 6cdc85842ad2bd6bf53480fa92e7a4d17c4b62d3..bc3fb67768f3f35b00952537dd449aeafd247fc0 100644
--- a/kernel/extended/liteipc/hm_liteipc.c
+++ b/kernel/extended/liteipc/hm_liteipc.c
@@ -862,7 +862,7 @@ LITE_OS_SEC_TEXT STATIC UINT32 CheckMsgSize(IpcMsg *msg)
             totalSize += obj->content.ptr.buffSz;
         }
     }
-    (VOID)LOS_MuxUnlock(&g_serviceHandleMapMux);
+    (VOID)LOS_MuxLock(&g_serviceHandleMapMux, LOS_WAIT_FOREVER);
     if (totalSize > g_cmsTask.maxMsgSize) {
         (VOID)LOS_MuxUnlock(&g_serviceHandleMapMux);
         return -EINVAL;