diff --git a/src/smallmap_gui.h b/src/smallmap_gui.h
--- a/src/smallmap_gui.h
+++ b/src/smallmap_gui.h
@@ -62,7 +62,7 @@ protected:
 
 	static SmallMapType map_type; ///< Currently displayed legends.
 	static bool show_towns;       ///< Display town names in the smallmap.
-	static int max_heightlevel;   ///< Currently used/cached maximum heightlevel.
+	static int map_height_limit;  ///< Currently used/cached map height limit.
 
 	static const uint LEGEND_BLOB_WIDTH = 8;              ///< Width of the coloured blob in front of a line text in the #WID_SM_LEGEND widget.
 	static const uint INDUSTRY_MIN_NUMBER_OF_COLUMNS = 2; ///< Minimal number of columns in the #WID_SM_LEGEND widget for the #SMT_INDUSTRY legend.