diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 340070415c2c..90fef69e4c5a 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -200,6 +200,7 @@ 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);