diff --git a/pixler.bas b/pixler.bas
index a81a7fd..ab6d5ad 100644
--- a/pixler.bas
+++ b/pixler.bas
@@ -46,7 +46,7 @@ _dest layers(0).ihandle
 addcommand "canvas ("+str$(_width)+","+str$(_height)+")"
 for y = 0 to _height - 16 step 16
     for x = 0 to _width - 16 step 16
-        if ((x / 16) + (y / 16)) mod 2 = 0 then
+        if ((x + y) / 16 AND 1) = 0 then
             line (x, y)-(x + 16, y + 16), _rgb32(127), bf
         else
             line (x, y)-(x + 16, y + 16), _rgb32(192), bf