diff --git a/src/sna/sna_render.c b/src/sna/sna_render.c
index 0796453d..5f79e04c 100644
--- a/src/sna/sna_render.c
+++ b/src/sna/sna_render.c
@@ -785,7 +785,7 @@ static int sna_render_picture_downsample(struct sna *sna,
 				if (!sna->render.composite(sna,
 							   PictOpSrc,
 							   tmp_src, NULL, tmp_dst,
-							   box.x1 + b.x1, box.y1 + b.y1,
+							   box.x1/2 + b.x1, box.y1/2 + b.y1,
 							   0, 0,
 							   b.x1, b.y1,
 							   b.x2 - b.x1, b.y2 - b.y1,