--- src/aarender.c.orig	2008-03-18 23:55:32.000000000 +0100
+++ src/aarender.c	2008-03-18 23:55:50.000000000 +0100
@@ -94,8 +94,8 @@
 	gamma = randomval / 2;
     mval = (c->parameters[c->filltable[255]].p[4]);
     for (y = y1; y < y2; y++) {
-	pos = 2 * y * wi;
-	pos1 = y * aa_scrwidth(c);
+	pos = 2 * (y * wi + x1);
+	pos1 = y * aa_scrwidth(c) + x1;
 	esum = 0;
 	for (x = x1; x < x2; x++) {
 	    i1 = table[((((int) c->imagebuffer[pos])))];