diff --git a/sound/pci/au88x0/au88x0.c b/sound/pci/au88x0/au88x0.c
index ef189d7f09d387bad1ce3f85e70bc15284565d88..6ed5ad59f5b5c5051bb17f7762b2f2b46da6d360 100644
--- a/sound/pci/au88x0/au88x0.c
+++ b/sound/pci/au88x0/au88x0.c
@@ -128,6 +128,7 @@ static int snd_vortex_dev_free(struct snd_device *device)
 	// 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);