diff --git a/include/linux/taskstats_kern.h b/include/linux/taskstats_kern.h
index dbb4d124c7d7..995cd19b56c1 100644
--- a/include/linux/taskstats_kern.h
+++ b/include/linux/taskstats_kern.h
@@ -14,7 +14,6 @@
 
 #ifdef CONFIG_TASKSTATS
 extern struct kmem_cache *taskstats_cache;
-extern struct mutex taskstats_exit_mutex;
 
 static inline void taskstats_tgid_free(struct signal_struct *sig)
 {