diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index ceb7ab3ba3d093bcc8d82caa3a28402c7d3ce582..43431816412c1116859ebd2f29574e1d191bf477 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1186,7 +1186,7 @@ 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;