diff --git a/drivers/net/smc91x.h b/drivers/net/smc91x.h
index 8310f1a..80fb80f 100644
--- a/drivers/net/smc91x.h
+++ b/drivers/net/smc91x.h
@@ -500,6 +500,9 @@
 	void __iomem *base;
 	void __iomem *datacs;
 
+	/* the low address lines on some platforms aren't connected... */
+	int	io_shift;
+
 	struct smc91x_platdata cfg;
 };