diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index bbf953e..ab17127 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -785,7 +785,7 @@
 			continue;
 
 		spin_lock(&dst->page_table_lock);
-		spin_lock(&src->page_table_lock);
+		spin_lock_nested(&src->page_table_lock, SINGLE_DEPTH_NESTING);
 		if (!huge_pte_none(huge_ptep_get(src_pte))) {
 			if (cow)
 				huge_ptep_set_wrprotect(src, addr, src_pte);