diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a09ca3b..c1592a9 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -941,8 +941,7 @@
 
 	/* Find the mm_struct */
 	read_lock(&tasklist_lock);
-	task = pid ?
-		find_task_by_pid_ns(pid, current->nsproxy->pid_ns) : current;
+	task = pid ? find_task_by_vpid(pid) : current;
 	if (!task) {
 		read_unlock(&tasklist_lock);
 		return -ESRCH;