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-rw-r--r--src/tile_map.cpp1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/tile_map.cpp b/src/tile_map.cpp
index a4d106ebe..945cbfab3 100644
--- a/src/tile_map.cpp
+++ b/src/tile_map.cpp
@@ -5,6 +5,7 @@
#include "stdafx.h"
#include "openttd.h"
#include "tile_map.h"
+#include "core/math_func.hpp"
Slope GetTileSlope(TileIndex tile, uint *h)
{