diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index 2bf670977b9c5bc2758341c8cbb269512c3d4584..9c3ad09d302224e1ecc2dd6aaf4fd8f30e348c3b 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1276,7 +1276,7 @@ static int switchtec_init_isr(struct switchtec_dev *stdev)
 	if (nvecs < 0)
 		return nvecs;
 
-	event_irq = ioread32(&stdev->mmio_part_cfg->vep_vector_number);
+	event_irq = ioread16(&stdev->mmio_part_cfg->vep_vector_number);
 	if (event_irq < 0 || event_irq >= nvecs)
 		return -EFAULT;