diff --git a/ttd.h b/ttd.h
--- a/ttd.h
+++ b/ttd.h
@@ -468,8 +468,9 @@ enum SpecialStrings {
 typedef void PlaceProc(uint tile);
 
 enum Sprites {
-	SPR_OPENTTD_BASE = 0x1406,
-	SPR_CANALS_BASE = SPR_OPENTTD_BASE + 80,
+	SPR_CANALS_BASE = 0x1406,
+	SPR_SLOPES_BASE = SPR_CANALS_BASE + 70,
+	SPR_OPENTTD_BASE = SPR_SLOPES_BASE + 74,
 };
 
 enum MAP_OWNERS {