diff --git a/src/MultiPlayer/mpmessages.hxx b/src/MultiPlayer/mpmessages.hxx
index c1382af..e1883d6 100644
--- a/src/MultiPlayer/mpmessages.hxx
+++ b/src/MultiPlayer/mpmessages.hxx
@@ -109,7 +109,10 @@ struct T_PositionMsg {
     // the earth centered frame
     xdr_data_t angularAccel[3];
     //zhongjin add
-    xdr_data_t jwhtext[4];
+
+    char airport[4]
+
+    xdr_data_t jwhtext[10];
 
     // Padding. The alignment is 8 bytes on x86_64 because there are
     // 8-byte types in the message, so the size should be explicitly