--- a/src/disaster_cmd.cpp	Fri Oct 19 21:14:38 2007 +0000
+++ b/src/disaster_cmd.cpp	Fri Oct 19 22:46:55 2007 +0000
@@ -60,7 +60,7 @@
 
 static void DisasterClearSquare(TileIndex tile)
 {
-	if (!EnsureNoVehicle(tile)) return;
+	if (!EnsureNoVehicleOnGround(tile)) return;
 
 	switch (GetTileType(tile)) {
 		case MP_RAILWAY: