diff --git a/chameleonic.p8 b/chameleonic.p8
index 8b871a5..acf6490 100644
--- a/chameleonic.p8
+++ b/chameleonic.p8
@@ -95,11 +95,10 @@ function linefill(ax,ay,bx,by,r,c)
   local _x1,_y1=x1,y1
   if(y0>y1) x0,y0,x1,y1=x1,y1,x0,y0
   local dx=(x1-x0)/(y1-y0)
-  if(y0<0) x0-=y0*dx y0=-1
   local cy0=y0\1+1
   -- sub-pix shift
   x0+=(cy0-y0)*dx
-  for y=y0\1+1,min(y1\1,127) do
+  for y=cy0,min(y1\1,127) do
    -- open span?
    local span=spans[y]
    if (span) rectfill(x0,y,span,y)