diff --git a/kernel/pid.c b/kernel/pid.c
index a9ae9f7fb229fd5b34d6d963d080f5c047714708..e9a31d362b2805f30cc4cb5ef67a6fe0ec14ee3d 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -354,7 +354,6 @@ void transfer_pid(struct task_struct *old, struct task_struct *new,
 {
 	new->pids[type].pid = old->pids[type].pid;
 	hlist_replace_rcu(&old->pids[type].node, &new->pids[type].node);
-	old->pids[type].pid = NULL;
 }
 
 struct task_struct *pid_task(struct pid *pid, enum pid_type type)