diff --git a/drivers/staging/dgap/dgap.c b/drivers/staging/dgap/dgap.c
index 914e332e13a136d9c910f554c5ff2affd2876c33..d4d98a78f3acfe22640cc579e65af61ac0054bd2 100644
--- a/drivers/staging/dgap/dgap.c
+++ b/drivers/staging/dgap/dgap.c
@@ -2196,7 +2196,7 @@ static struct board_t *dgap_found_board(struct pci_dev *pdev, int id,
 	 * will be mapped into the low 2MB of the 4MB memory space
 	 */
 	brd->port = brd->membase + PCI_IO_OFFSET;
-	brd->port_end = brd->port + PCI_IO_SIZE;
+	brd->port_end = brd->port + PCI_IO_SIZE_DGAP;
 
 	/*
 	 * Special initialization for non-PLX boards
diff --git a/drivers/staging/dgap/dgap.h b/drivers/staging/dgap/dgap.h
index 684033156e8c3f9a9db6c0563bcddbf6e7d08d0a..a2e5b26c673ad151361a8f8820f66022d577cdf4 100644
--- a/drivers/staging/dgap/dgap.h
+++ b/drivers/staging/dgap/dgap.h
@@ -121,7 +121,7 @@
 #define PCI_IO_OFFSET		0x00200000
 
 /* Size of IO (2MB) */
-#define PCI_IO_SIZE		0x00200000
+#define PCI_IO_SIZE_DGAP	0x00200000
 
 /* Number of boards we support at once. */
 #define	MAXBOARDS	32