diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 087ba3e..7be1ce8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1048,7 +1048,7 @@
 			bad += free_pages_check(page + i);
 		}
 	}
-	if (PageAnon(page))
+	if (PageAnonHead(page))
 		page->mapping = NULL;
 	bad += free_pages_check(page);
 	if (bad)