diff --git a/drivers/gpu/drm/gma500/gtt.c b/drivers/gpu/drm/gma500/gtt.c
index 92babac362ec0b85b6f1e52f05a6402411b43d1e..2db731f00930d7b28d85e124744423c8a37dd8b4 100644
--- a/drivers/gpu/drm/gma500/gtt.c
+++ b/drivers/gpu/drm/gma500/gtt.c
@@ -204,6 +204,7 @@ static int psb_gtt_attach_pages(struct gtt_range *gt)
 	if (IS_ERR(pages))
 		return PTR_ERR(pages);
 
+	gt->npage = gt->gem.size / PAGE_SIZE;
 	gt->pages = pages;
 
 	return 0;