5 files changed, 18 insertions, 13 deletions
diff --git a/Makefile b/Makefile
index 3b8090542..318b12255 100644
--- a/Makefile
+++ b/Makefile
@@ -624,6 +624,7 @@ C_SOURCES += strings.c
 C_SOURCES += subsidy_gui.c
 C_SOURCES += terraform_gui.c
 C_SOURCES += texteff.c
+C_SOURCES += tile.c
 C_SOURCES += town_cmd.c
 C_SOURCES += town_gui.c
 C_SOURCES += train_cmd.c
diff --git a/functions.h b/functions.h
index 36a8e6295..e39e27d38 100644
--- a/functions.h
+++ b/functions.h
@@ -14,8 +14,6 @@ int GetTileZ(uint tile);
 
 void DoClearSquare(uint tile);
 void CDECL ModifyTile(uint tile, uint flags, ...);
-void SetMapExtraBits(uint tile, byte flags);
-uint GetMapExtraBits(uint tile);
 void RunTileLoop(void);
 
 uint GetPartialZ(int x, int y, int corners);
diff --git a/landscape.c b/landscape.c
index 4e14682fd..993badea8 100644
--- a/landscape.c
+++ b/landscape.c
@@ -430,17 +430,6 @@ void CDECL ModifyTile(uint tile, uint flags, ...)
 		MarkTileDirtyByTile(tile);
 }
 
-void SetMapExtraBits(uint tile, byte bits)
-{
-	_map_extra_bits[tile >> 2] &= ~(3 << ((tile&3)*2));
-	_map_extra_bits[tile >> 2] |= (bits&3) << ((tile&3)*2);
-}
-
-uint GetMapExtraBits(uint tile)
-{
-	assert(tile < MapSize());
-	return (_map_extra_bits[tile >> 2] >> (tile & 3) * 2) & 3;
-}
 
 #define TILELOOP_BITS 4
 #define TILELOOP_SIZE (1 << TILELOOP_BITS)
diff --git a/tile.c b/tile.c
new file mode 100644
index 000000000..f8641ca98
--- /dev/null
+++ b/tile.c
@@ -0,0 +1,14 @@
+#include "tile.h"
+
+void SetMapExtraBits(TileIndex tile, byte bits)
+{
+	assert(tile < MapSize());
+	_map_extra_bits[tile >> 2] &= ~(3 << ((tile & 3) * 2));
+	_map_extra_bits[tile >> 2] |= (bits&3) << ((tile & 3) * 2);
+}
+
+uint GetMapExtraBits(TileIndex tile)
+{
+	assert(tile < MapSize());
+	return (_map_extra_bits[tile >> 2] >> (tile & 3) * 2) & 3;
+}
diff --git a/tile.h b/tile.h
index 0019397dd..ec274d62f 100644
--- a/tile.h
+++ b/tile.h
@@ -3,6 +3,9 @@
 
 #include "map.h"
 
+void SetMapExtraBits(TileIndex tile, byte flags);
+uint GetMapExtraBits(TileIndex tile);
+
 static inline uint TileHeight(TileIndex tile)
 {
 	assert(tile < MapSize());