diff --git a/drivers/staging/comedi/drivers/jr3_pci.c b/drivers/staging/comedi/drivers/jr3_pci.c
index 653c5c3891e1..90b303ab2300 100644
--- a/drivers/staging/comedi/drivers/jr3_pci.c
+++ b/drivers/staging/comedi/drivers/jr3_pci.c
@@ -705,9 +705,7 @@ static int jr3_pci_auto_attach(struct comedi_device *dev,
 	if (result)
 		return result;
 
-	devpriv->iobase = ioremap(pci_resource_start(pcidev, 0),
-				  offsetof(struct jr3_t,
-					   channel[devpriv->n_channels]));
+	devpriv->iobase = pci_ioremap_bar(pcidev, 0);
 	if (!devpriv->iobase)
 		return -ENOMEM;