diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index f1e0569..639d5e7 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -878,7 +878,7 @@ static inline bool page_copy_sane(struct page *page, size_t offset, size_t n)
 	head = compound_head(page);
 	v += (page - head) << PAGE_SHIFT;
 
-	if (likely(n <= v && v <= (PAGE_SIZE << compound_order(head))))
+	if (likely(n <= v && v <= (page_size(head))))
 		return true;
 	WARN_ON(1);
 	return false;