diff --git a/landscape.c b/landscape.c
index af0b8cb9b6..b96c984912 100644
--- a/landscape.c
+++ b/landscape.c
@@ -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 @@ void InitializeLandscape(void)
 	}
 
 	// 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)
diff --git a/openttd.c b/openttd.c
index f99882e650..a078bad5a6 100644
--- a/openttd.c
+++ b/openttd.c
@@ -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 @@ static void UpdateVoidTiles(void)
 {
 	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)
diff --git a/void.h b/void.h
new file mode 100644
index 0000000000..711859fa24
--- /dev/null
+++ b/void.h
@@ -0,0 +1,6 @@
+/* $Id$ */
+
+static inline void MakeVoid(TileIndex t)
+{
+	SetTileType(t, MP_VOID);
+}