diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 8c7b3e5a2d019262eafbb9ccd0514f3278c9255e..3a17107594c88a83f013ecc1123c10d76c6d30c2 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -148,6 +148,7 @@ enum mce_notifier_prios {
 	MCE_PRIO_LOWEST		= 0,
 };
 
+struct notifier_block;
 extern void mce_register_decode_chain(struct notifier_block *nb);
 extern void mce_unregister_decode_chain(struct notifier_block *nb);