diff --git a/drivers/serial/sunsu.c b/drivers/serial/sunsu.c
index d3a5aee..9b3b9aa 100644
--- a/drivers/serial/sunsu.c
+++ b/drivers/serial/sunsu.c
@@ -1499,6 +1499,9 @@
 		uart_remove_one_port(&sunsu_reg, &up->port);
 	}
 
+	if (up->port.membase)
+		of_iounmap(up->port.membase, up->reg_size);
+
 	dev_set_drvdata(&dev->dev, NULL);
 
 	return 0;