diff --git a/mm/kmsan/shadow.c b/mm/kmsan/shadow.c
index 87318f9170f1..8b619191299d 100644
--- a/mm/kmsan/shadow.c
+++ b/mm/kmsan/shadow.c
@@ -210,7 +210,7 @@ void kmsan_free_page(struct page *page, unsigned int order)
 		return;
 	kmsan_enter_runtime();
 	kmsan_internal_poison_memory(page_address(page),
-				     page_size(page),
+				     PAGE_SIZE << order,
 				     GFP_KERNEL,
 				     KMSAN_POISON_CHECK | KMSAN_POISON_FREE);
 	kmsan_leave_runtime();