diff --git a/arch/alpha/kernel/sys_titan.c b/arch/alpha/kernel/sys_titan.c
index f6c108a3d6730ee3125e8c0c682bd6cb9b48ba48..8c13a0c77830c576a2f9030fedb3b44951f654de 100644
--- a/arch/alpha/kernel/sys_titan.c
+++ b/arch/alpha/kernel/sys_titan.c
@@ -149,6 +149,7 @@ static int
 titan_set_irq_affinity(struct irq_data *d, const struct cpumask *affinity,
 		       bool force)
 { 
+	unsigned int irq = d->irq;
 	spin_lock(&titan_irq_lock);
 	titan_cpu_set_irq_affinity(irq - 16, *affinity);
 	titan_update_irq_hw(titan_cached_irq_mask);