diff --git a/sound/pci/au88x0/au88x0.c b/sound/pci/au88x0/au88x0.c
index ef189d7..6ed5ad5 100644
--- a/sound/pci/au88x0/au88x0.c
+++ b/sound/pci/au88x0/au88x0.c
@@ -128,6 +128,7 @@
 	// Take down PCI interface.
 	synchronize_irq(vortex->irq);
 	free_irq(vortex->irq, vortex);
+	iounmap(vortex->mmio);
 	pci_release_regions(vortex->pci_dev);
 	pci_disable_device(vortex->pci_dev);
 	kfree(vortex);