diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index 0b3ec38..2f5a5ac 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2650,8 +2650,9 @@
 		ret = serial8250_register_port(&port);
 		if (ret < 0) {
 			dev_err(&dev->dev, "unable to register port at index %d "
-				"(IO%lx MEM%lx IRQ%d): %d\n", i,
-				p->iobase, p->mapbase, p->irq, ret);
+				"(IO%lx MEM%llx IRQ%d): %d\n", i,
+				p->iobase, (unsigned long long)p->mapbase,
+				p->irq, ret);
 		}
 	}
 	return 0;