diff --git a/tile.h b/tile.h
index 65d2c31f2d..dd96390720 100644
--- a/tile.h
+++ b/tile.h
@@ -5,6 +5,7 @@
 
 #include "macros.h"
 #include "map.h"
+#include "slope.h"
 
 typedef enum TileTypes {
 	MP_CLEAR,
diff --git a/town_cmd.c b/town_cmd.c
index e54be61eef..a6e487034c 100644
--- a/town_cmd.c
+++ b/town_cmd.c
@@ -3,7 +3,6 @@
 #include "stdafx.h"
 #include "openttd.h"
 #include "functions.h"
-#include "slope.h"
 #include "strings.h"
 #include "table/strings.h"
 #include "table/sprites.h"
diff --git a/tunnelbridge_cmd.c b/tunnelbridge_cmd.c
index ae4705a86f..47a7ce8701 100644
--- a/tunnelbridge_cmd.c
+++ b/tunnelbridge_cmd.c
@@ -9,7 +9,6 @@
 #include "openttd.h"
 #include "bridge_map.h"
 #include "road_map.h"
-#include "slope.h"
 #include "table/sprites.h"
 #include "table/strings.h"
 #include "functions.h"