diff --git a/include/linux/pid_namespace.h b/include/linux/pid_namespace.h
index 1af82c4e17d4e79a14d1854b35fd39ef93bdb649..d82fe825d62f9571fe6412700d854a326f5d8c4c 100644
--- a/include/linux/pid_namespace.h
+++ b/include/linux/pid_namespace.h
@@ -84,12 +84,6 @@ static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
 	return tsk->nsproxy->pid_ns;
 }
 
-static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
-{
-	BUG_ON(tsk != current);
-	return tsk->nsproxy->pid_ns->child_reaper;
-}
-
 void pidhash_init(void);
 void pidmap_init(void);