diff --git a/include/linux/stallion.h b/include/linux/stallion.h
index 4a0a329..94b4a10 100644
--- a/include/linux/stallion.h
+++ b/include/linux/stallion.h
@@ -75,7 +75,7 @@
 	int			ioaddr;
 	int			uartaddr;
 	unsigned int		pagenr;
-	long			istate;
+	unsigned long		istate;
 	int			flags;
 	int			baud_base;
 	int			custom_divisor;