diff --git a/src/smallmap_gui.h b/src/smallmap_gui.h
--- a/src/smallmap_gui.h
+++ b/src/smallmap_gui.h
@@ -157,7 +157,6 @@ protected:
 	void DrawSmallMapColumn(void *dst, uint xc, uint yc, int pitch, int reps, int start_pos, int end_pos, Blitter *blitter) const;
 	void DrawVehicles(const DrawPixelInfo *dpi, Blitter *blitter) const;
 	void DrawTowns(const DrawPixelInfo *dpi) const;
-	Point GetSmallMapCoordIncludingHeight(Point viewport_coord) const;
 	void DrawSmallMap(DrawPixelInfo *dpi) const;
 
 	Point RemapTile(int tile_x, int tile_y) const;