diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 2a362c5..5faf876 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -531,7 +531,7 @@
 	 * so it's less likely to be used soon and more likely to be merged
 	 * as a higher order page
 	 */
-	if ((order < MAX_ORDER-1) && pfn_valid_within(page_to_pfn(buddy))) {
+	if ((order < MAX_ORDER-2) && pfn_valid_within(page_to_pfn(buddy))) {
 		struct page *higher_page, *higher_buddy;
 		combined_idx = __find_combined_index(page_idx, order);
 		higher_page = page + combined_idx - page_idx;