diff --git a/src/MultiPlayer/multiplaymgr.cxx b/src/MultiPlayer/multiplaymgr.cxx
index b46bd47..07f31ab 100644
--- a/src/MultiPlayer/multiplaymgr.cxx
+++ b/src/MultiPlayer/multiplaymgr.cxx
@@ -1480,7 +1480,7 @@ FGMultiplayMgr::SendMyPosition(const FGExternalMotionData& motionInfo)
         PosMsg->jwhtext[11] = XDR_encode_float (xxx);
         
         xxx = fgGetDouble("/position/altitude-agl-m",true);
-        PosMsg->jwhtext[11] = XDR_encode_float (xxx);
+        PosMsg->jwhtext[12] = XDR_encode_float (xxx);
         
 
         //n = fgGetNode("");