diff --git a/drivers/staging/comedi/drivers/dt3000.c b/drivers/staging/comedi/drivers/dt3000.c
index 2c1c6140f38f..af0202474127 100644
--- a/drivers/staging/comedi/drivers/dt3000.c
+++ b/drivers/staging/comedi/drivers/dt3000.c
@@ -252,7 +252,7 @@ struct dt3k_private {
 
 	struct pci_dev *pci_dev;
 	resource_size_t phys_addr;
-	void *io_addr;
+	void __iomem *io_addr;
 	unsigned int lock;
 	unsigned int ao_readback[2];
 	unsigned int ai_front;