diff --git a/fs/exec.c b/fs/exec.c
index 0b09447..6ffb769 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -776,7 +776,7 @@
 	 * so it is safe to do it under read_lock.
 	 */
 	if (unlikely(tsk->group_leader == child_reaper(tsk)))
-		tsk->nsproxy->pid_ns->child_reaper = tsk;
+		task_active_pid_ns(tsk)->child_reaper = tsk;
 
 	zap_other_threads(tsk);
 	read_unlock(&tasklist_lock);