diff --git a/src/r_bbox.c b/src/r_bbox.c
index 2350d702e..3654565a8 100644
--- a/src/r_bbox.c
+++ b/src/r_bbox.c
@@ -56,11 +56,11 @@ raster_bbox_seg
 {
 	y /= FRACUNIT;
 
+	h = y + (FixedCeil(abs(h)) / FRACUNIT);
+
 	if (y < 0)
 		y = 0;
 
-	h = y + (FixedCeil(abs(h)) / FRACUNIT);
-
 	if (h >= viewheight)
 		h = viewheight;
 
@@ -124,9 +124,6 @@ draw_bbox_row
 	x1 = a->x;
 	x2 = b->x;
 
-	if (x2 >= viewwidth)
-		x2 = viewwidth - 1;
-
 	if (x1 == x2 || x1 >= viewwidth || x2 < 0)
 		return;
 
@@ -154,6 +151,9 @@ draw_bbox_row
 		x1 = 0;
 	}
 
+	if (x2 >= viewwidth)
+		x2 = viewwidth - 1;
+
 	while (x1 < x2)
 	{
 		raster_bbox_seg(x1, y1, s1, bb->color);