diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h
index 458ad28338fe..b00836851061 100644
--- a/drivers/tty/serial/8250/8250.h
+++ b/drivers/tty/serial/8250/8250.h
@@ -56,7 +56,7 @@ struct old_serial_port {
 	unsigned int flags;
 	unsigned char hub6;
 	unsigned char io_type;
-	unsigned char *iomem_base;
+	unsigned char __iomem *iomem_base;
 	unsigned short iomem_reg_shift;
 	unsigned long irqflags;
 };