diff --git a/mm/page_owner.c b/mm/page_owner.c
index d2db436..65e24fb 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -285,7 +285,11 @@
 				continue;
 
 			if (PageBuddy(page)) {
-				pfn += (1UL << page_order(page)) - 1;
+				unsigned long freepage_order;
+
+				freepage_order = page_order_unsafe(page);
+				if (freepage_order < MAX_ORDER)
+					pfn += (1UL << freepage_order) - 1;
 				continue;
 			}