diff --git a/drivers/mfd/pcf50633-core.c b/drivers/mfd/pcf50633-core.c
index 710e417e0ee..5439282804c 100644
--- a/drivers/mfd/pcf50633-core.c
+++ b/drivers/mfd/pcf50633-core.c
@@ -218,7 +218,7 @@ static struct attribute_group pcf_attr_group = {
 int pcf50633_register_irq(struct pcf50633 *pcf, int irq,
 			void (*handler) (int, void *), void *data)
 {
-	if (irq < 0 || irq > PCF50633_NUM_IRQ || !handler)
+	if (irq < 0 || irq >= PCF50633_NUM_IRQ || !handler)
 		return -EINVAL;
 
 	if (WARN_ON(pcf->irq_handler[irq].handler))
@@ -235,7 +235,7 @@ EXPORT_SYMBOL_GPL(pcf50633_register_irq);
 
 int pcf50633_free_irq(struct pcf50633 *pcf, int irq)
 {
-	if (irq < 0 || irq > PCF50633_NUM_IRQ)
+	if (irq < 0 || irq >= PCF50633_NUM_IRQ)
 		return -EINVAL;
 
 	mutex_lock(&pcf->lock);