diff --git a/mm/slab.c b/mm/slab.c
index b1113561b98b1..2e67a513b0c9a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1399,7 +1399,8 @@ static void kmem_freepages(struct kmem_cache *cachep, struct page *page)
 	__ClearPageSlabPfmemalloc(page);
 	__ClearPageSlab(page);
 	page_mapcount_reset(page);
-	page->mapping = NULL;
+	/* In union with page->mapping where page allocator expects NULL */
+	page->slab_cache = NULL;
 
 	if (current->reclaim_state)
 		current->reclaim_state->reclaimed_slab += 1 << order;
diff --git a/mm/slub.c b/mm/slub.c
index 34dcc09e2ec9b..2098a544c4e24 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1836,8 +1836,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page)
 
 	__ClearPageSlabPfmemalloc(page);
 	__ClearPageSlab(page);
-
-	page->mapping = NULL;
+	/* In union with page->mapping where page allocator expects NULL */
+	page->slab_cache = NULL;
 	if (current->reclaim_state)
 		current->reclaim_state->reclaimed_slab += pages;
 	unaccount_slab_page(page, order, s);