diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 8c17d551f32bc594622c2d5f20fdde830c1f6c86..67dadbd97adb7b38d0e047a068252d4febffe23a 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -2248,7 +2248,7 @@ static int sci_init_single(struct platform_device *dev,
 
 	port->mapbase		= p->mapbase;
 	port->type		= p->type;
-	port->flags		= p->flags;
+	port->flags		= UPF_FIXED_PORT | p->flags;
 	port->regshift		= p->regshift;
 
 	/*