diff --git a/gegl/buffer/gegl-buffer-iterator.c b/gegl/buffer/gegl-buffer-iterator.c
index 191c148..6de99cb 100644
--- a/gegl/buffer/gegl-buffer-iterator.c
+++ b/gegl/buffer/gegl-buffer-iterator.c
@@ -155,8 +155,8 @@ gegl_buffer_tile_iterator_next (GeglBufferTileIterator *i)
   gint  tile_height    = buffer->tile_storage->tile_height;
   gint  buffer_shift_x = buffer->shift_x;
   gint  buffer_shift_y = buffer->shift_y;
-  gint  buffer_x       = i->roi.x + buffer_shift_x;
-  gint  buffer_y       = i->roi.y + buffer_shift_y;
+  gint  buffer_x       = i->roi.x - buffer_shift_x;
+  gint  buffer_y       = i->roi.y - buffer_shift_y;
 
   if (i->roi.width == 0 || i->roi.height == 0)
     return FALSE;