--- a/landscape.c	Fri Feb 24 17:52:07 2006 +0000
+++ b/landscape.c	Fri Feb 24 19:52:26 2006 +0000
@@ -14,6 +14,7 @@
 #include "command.h"
 #include "vehicle.h"
 #include "variables.h"
+#include "void.h"
 
 extern const TileTypeProcs
 	_tile_type_clear_procs,
@@ -447,10 +448,8 @@
 	}
 
 	// create void tiles at the border
-	for (i = 0; i < MapMaxY(); ++i)
-		SetTileType(i * MapSizeX() + MapMaxX(), MP_VOID);
-	for (i = 0; i < MapSizeX(); ++i)
-		SetTileType(MapSizeX() * MapMaxY() + i, MP_VOID);
+	for (i = 0; i < MapMaxY(); ++i) MakeVoid(i * MapSizeX() + MapMaxX());
+	for (i = 0; i < MapSizeX(); ++i) MakeVoid(MapSizeX() * MapMaxY() + i);
 }
 
 void ConvertGroundTilesIntoWaterTiles(void)

--- a/openttd.c	Fri Feb 24 17:52:07 2006 +0000
+++ b/openttd.c	Fri Feb 24 19:52:26 2006 +0000
@@ -9,6 +9,7 @@
 #include "strings.h"
 #include "map.h"
 #include "tile.h"
+#include "void.h"
 
 #define VARDEF
 #include "openttd.h"
@@ -1059,10 +1060,8 @@
 {
 	uint i;
 
-	for (i = 0; i < MapMaxY(); ++i)
-		SetTileType(i * MapSizeX() + MapMaxX(), MP_VOID);
-	for (i = 0; i < MapSizeX(); ++i)
-		SetTileType(MapSizeX() * MapMaxY() + i, MP_VOID);
+	for (i = 0; i < MapMaxY(); ++i) MakeVoid(i * MapSizeX() + MapMaxX());
+	for (i = 0; i < MapSizeX(); ++i) MakeVoid(MapSizeX() * MapMaxY() + i);
 }
 
 // since savegame version 6.0 each sign has an "owner", signs without owner (from old games are set to 255)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/void.h	Fri Feb 24 19:52:26 2006 +0000
@@ -0,0 +1,6 @@
+/* $Id$ */
+
+static inline void MakeVoid(TileIndex t)
+{
+	SetTileType(t, MP_VOID);
+}