diff --git a/src/MultiPlayer/multiplaymgr.cxx b/src/MultiPlayer/multiplaymgr.cxx
index d9bf31d..d8d3d5b 100644
--- a/src/MultiPlayer/multiplaymgr.cxx
+++ b/src/MultiPlayer/multiplaymgr.cxx
@@ -729,7 +729,11 @@ namespace
 {
   bool verifyProperties(const xdr_data_t* data, const xdr_data_t* end)
   {
+
+    //zhongjin
     using namespace simgear;
+    FlightProperties ifce;
+
     const xdr_data_t* xdr = data;
     while (xdr < end) {
       unsigned id = XDR_decode_uint32(*xdr);
@@ -1345,6 +1349,8 @@ FGMultiplayMgr::isSane(const FGExternalMotionData& motionInfo)
 void
 FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
 {
+  using namespace simgear;
+
   int protocolToUse = getProtocolToUse();
   int transmitFilterPropertyBase = pMultiPlayTransmitPropertyBase->getIntValue();
   if ((! mInitialised) || (! mHaveServer))