diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 470db6efaeb6..a031d99becb7 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -176,7 +176,7 @@ static void __init pseries_mpic_init_IRQ(void)
 		return;
 
 	cascade_irq = irq_of_parse_and_map(cascade, 0);
-	if (cascade == NO_IRQ) {
+	if (cascade_irq == NO_IRQ) {
 		printk(KERN_ERR "mpic: failed to map cascade interrupt");
 		return;
 	}