diff --git a/bcwc_drv.c b/bcwc_drv.c
index 7c6cd49..f7531e4 100644
--- a/bcwc_drv.c
+++ b/bcwc_drv.c
@@ -40,11 +40,13 @@ static int bcwc_pci_reserve_mem(struct bcwc_private *dev_priv)
 	start = pci_resource_start(dev_priv->pdev, BCWC_PCI_LINK_IO);
 	len = pci_resource_len(dev_priv->pdev, BCWC_PCI_LINK_IO);
 	dev_priv->link_io = ioremap_nocache(start, len);
+	dev_priv->link_io_len = len;
 
 	/* Device IO */
 	start = pci_resource_start(dev_priv->pdev, BCWC_PCI_DEV_IO);
 	len = pci_resource_len(dev_priv->pdev, BCWC_PCI_DEV_IO);
 	dev_priv->dev_io = ioremap_nocache(start, len);
+	dev_priv->dev_io_len = len;
 
 	return 0;
 }
diff --git a/bcwc_drv.h b/bcwc_drv.h
index dadc167..2dab1e0 100644
--- a/bcwc_drv.h
+++ b/bcwc_drv.h
@@ -24,7 +24,9 @@ struct bcwc_private {
 
 	/* Mapped PCI resources */
 	void *link_io;
+	u32 link_io_len;
 	void *dev_io;
+	u32 dev_io_len;
 
 	struct work_struct irq_work;