diff --git a/src/cairo-win32-surface.c b/src/cairo-win32-surface.c
index f433b3d..e2db320 100644
--- a/src/cairo-win32-surface.c
+++ b/src/cairo-win32-surface.c
@@ -1431,10 +1431,10 @@ _cairo_win32_surface_set_clip_region (void           *abstract_surface,
 	data->rdh.iType = RDH_RECTANGLES;
 	data->rdh.nCount = num_boxes;
 	data->rdh.nRgnSize = num_boxes * sizeof (RECT);
-	data->rdh.rcBound.left = extents->x1;
-	data->rdh.rcBound.top = extents->y1;
-	data->rdh.rcBound.right = extents->x2;
-	data->rdh.rcBound.bottom = extents->y2;
+	data->rdh.rcBound.left = extents.x;
+	data->rdh.rcBound.top = extents.y;
+	data->rdh.rcBound.right = extents.x + extents.width;
+	data->rdh.rcBound.bottom = extents.y + extents.height;
 
 	for (i = 0; i < num_boxes; i++) {
 	    rects[i].left = boxes[i].p1.x;