diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -3967,7 +3967,8 @@
 		pa = VM_PAGE_TO_PHYS(m) | cache_bits;
 		if ((*pte & (PG_FRAME | X86_PG_PTE_CACHE)) != pa) {
 			oldpte |= *pte;
-			pte_store(pte, pa | pg_g | pg_nx | X86_PG_RW | X86_PG_V);
+			pte_store(pte, pa | pg_g | pg_nx | X86_PG_A |
+			    X86_PG_M | X86_PG_RW | X86_PG_V);
 		}
 		pte++;
 	}