diff --git a/sys/i386/xen/pmap.c b/sys/i386/xen/pmap.c
index e956777b5b01..e91ebaf48751 100644
--- a/sys/i386/xen/pmap.c
+++ b/sys/i386/xen/pmap.c
@@ -3647,7 +3647,9 @@ pmap_map_readonly(pmap_t pmap, vm_offset_t va, int len)
 	for (i = 0; i < npages; i++) {
 		pt_entry_t *pte;
 		pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE));
+		vm_page_lock_queues();
 		pte_store(pte, xpmap_mtop(*pte & ~(PG_RW|PG_M)));
+		vm_page_unlock_queues();
 		PMAP_MARK_PRIV(xpmap_mtop(*pte));
 		pmap_pte_release(pte);
 	}
@@ -3661,7 +3663,9 @@ pmap_map_readwrite(pmap_t pmap, vm_offset_t va, int len)
 		pt_entry_t *pte;
 		pte = pmap_pte(pmap, (vm_offset_t)(va + i*PAGE_SIZE));
 		PMAP_MARK_UNPRIV(xpmap_mtop(*pte));
+		vm_page_lock_queues();
 		pte_store(pte, xpmap_mtop(*pte) | (PG_RW|PG_M));
+		vm_page_unlock_queues();
 		pmap_pte_release(pte);
 	}
 }