diff --git a/arch/x86_64/kernel/hpet.c b/arch/x86_64/kernel/hpet.c
index 636f4f9fc6bb18..e2d1b912e15469 100644
--- a/arch/x86_64/kernel/hpet.c
+++ b/arch/x86_64/kernel/hpet.c
@@ -133,7 +133,7 @@ struct clocksource clocksource_hpet = {
 	.vread		= vread_hpet,
 };
 
-int hpet_arch_init(void)
+int __init hpet_arch_init(void)
 {
 	unsigned int id;
 	u64 tmp;