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-rw-r--r--src/viewport_func.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/viewport_func.h b/src/viewport_func.h
index df4f8abce..7faa173a1 100644
--- a/src/viewport_func.h
+++ b/src/viewport_func.h
@@ -74,4 +74,6 @@ void UpdateAllVirtCoords();
extern Point _tile_fract_coords;
+void MarkTileDirtyByTile(TileIndex tile);
+
#endif /* VIEWPORT_FUNC_H */