diff --git a/mm/mremap.c b/mm/mremap.c
index ebe27a8..463a257 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -135,7 +135,7 @@
 	pte_unmap(new_pte - 1);
 	pte_unmap_unlock(old_pte - 1, old_ptl);
 	if (anon_vma)
-		anon_vma_unlock(anon_vma);
+		anon_vma_unlock_write(anon_vma);
 	if (mapping)
 		mutex_unlock(&mapping->i_mmap_mutex);
 }