diff --git a/include/notifier.h b/include/notifier.h
index 878b17e..cb2be5f 100644
--- a/include/notifier.h
+++ b/include/notifier.h
@@ -15,6 +15,7 @@
 };
 
 int notifier_chain_register(struct notifier_head *nh, struct notifier_block *n);
+int notifier_chain_unregister(struct notifier_head *nh, struct notifier_block *n);
 
 int notifier_call_chain(struct notifier_head *nh, unsigned long val, void *v);