diff --git a/arch/x86/kernel/apic/x2apic_phys.c b/arch/x86/kernel/apic/x2apic_phys.c
index f8d9d69994e619f3abb90dbcb135a130cbe257f5..e2829bf40e4a09c2fd31241be37b030c6cd1570a 100644
--- a/arch/x86/kernel/apic/x2apic_phys.c
+++ b/arch/x86/kernel/apic/x2apic_phys.c
@@ -14,7 +14,7 @@ int x2apic_phys;
 
 static struct apic apic_x2apic_phys;
 
-static int set_x2apic_phys_mode(char *arg)
+static int __init set_x2apic_phys_mode(char *arg)
 {
 	x2apic_phys = 1;
 	return 0;