diff --git a/landscape.c b/landscape.c
index a86a6c4636..26545958cd 100644
--- a/landscape.c
+++ b/landscape.c
@@ -65,14 +65,12 @@ void FindLandscapeHeight(TileInfo *ti, uint x, uint y)
 		ti->tileh = 0;
 		ti->type = MP_VOID;
 		ti->tile = 0;
-		ti->map5 = 0;
 		ti->z = 0;
 	} else {
 		TileIndex tile = TileVirtXY(x, y);
 
 		ti->tile = tile;
 		ti->type = GetTileType(tile);
-		ti->map5 = _m[tile].m5;
 		ti->tileh = GetTileSlope(tile, &ti->z);
 	}
 }
diff --git a/openttd.h b/openttd.h
index 1038d3bbf3..e391002d6b 100644
--- a/openttd.h
+++ b/openttd.h
@@ -129,7 +129,6 @@ typedef struct TileInfo {
 	uint y;
 	uint tileh;
 	uint type;
-	uint map5;
 	TileIndex tile;
 	uint z;
 } TileInfo;