Index: pcb_draw.c
===================================================================
--- pcb_draw.c	(revision 7409)
+++ pcb_draw.c	(revision 7410)
@@ -115,8 +115,8 @@
 			continue;
 		if (x1 < 0)
 			x1 = 0;
-		if (x2 >= dst->sy)
-			x2 = dst->sy;
+		if (x2 >= dst->sx)
+			x2 = dst->sx-1;
 		p = &image_pix(dst, x1, y+yc);
 		for(x = x1; x <= x2; x++,p++) {
 			*p = pixel_black;