--- a/water_cmd.c	Sat Jun 04 11:56:32 2005 +0000
+++ b/water_cmd.c	Sat Jun 04 12:13:24 2005 +0000
@@ -689,7 +689,7 @@
 	if (!IsTileOwner(tile, old_player)) return;
 
 	if (new_player != 255) {
-		_map_owner[tile] = new_player;
+		SetTileOwner(tile, new_player);
 	} else {
 		DoCommandByTile(tile, 0, 0, DC_EXEC, CMD_LANDSCAPE_CLEAR);
 	}