diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
index fac014a81b24..4d161c70ba55 100644
--- a/kernel/irq/proc.c
+++ b/kernel/irq/proc.c
@@ -220,7 +220,7 @@ void unregister_handler_proc(unsigned int irq, struct irqaction *action)
 	}
 }
 
-void register_default_affinity_proc(void)
+static void register_default_affinity_proc(void)
 {
 #ifdef CONFIG_SMP
 	proc_create("irq/default_smp_affinity", 0600, NULL,