diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index ff40bf92db43..a2c872de29a6 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -2791,6 +2791,7 @@ int s390_replace_asce(struct gmap *gmap)
 	page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER);
 	if (!page)
 		return -ENOMEM;
+	page->index = 0;
 	table = page_to_virt(page);
 	memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT));