diff --git a/kernel/fork.c b/kernel/fork.c
index c2657304d67b..8f188222a41b 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -443,6 +443,7 @@ void put_task_stack(struct task_struct *tsk)
 	if (refcount_dec_and_test(&tsk->stack_refcount))
 		release_task_stack(tsk);
 }
+EXPORT_SYMBOL_GPL(put_task_stack);
 #endif
 
 void free_task(struct task_struct *tsk)