diff --git a/Strategic/Strategic Movement.cpp b/Strategic/Strategic Movement.cpp
index b1e0b6be..4afc1b94 100644
--- a/Strategic/Strategic Movement.cpp	
+++ b/Strategic/Strategic Movement.cpp	
@@ -2644,6 +2644,7 @@ BOOLEAN PossibleToCoordinateSimultaneousGroupArrivals( GROUP *pFirstGroup )
 	{
 		if ( pGroup != pFirstGroup && (pGroup->usGroupTeam == OUR_TEAM || pGroup->usGroupTeam == MILITIA_TEAM) && pGroup->fBetweenSectors &&
 			pGroup->ubNextX == pFirstGroup->ubSectorX && pGroup->ubNextY == pFirstGroup->ubSectorY &&
+			pFirstGroup->ubSectorZ == pGroup->ubSectorZ &&
 				!(pGroup->uiFlags & GROUPFLAG_SIMULTANEOUSARRIVAL_CHECKED) &&
 				!IsGroupTheHelicopterGroup( pGroup ) )
 		{