diff --git a/common.py b/common.py
index ff15d65..4c75027 100644
--- a/common.py
+++ b/common.py
@@ -87,7 +87,7 @@ def get_lon(tile):
 # Returns precise west boundary of tile
 def get_west(tile):
 	lon = ((16760832 & int(tile)) >> 14) - 180
-	y = (7 & int(tile)) / (1 / get_tile_width(get_lat(tile)))
+	y = (7 & int(tile)) / (1 / get_tile_width(get_south(tile)))
 	return lon + y
 
 # Returns east boundary of tile