diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index b1ae774016f..737b4c96097 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1089,7 +1089,7 @@ static void autoconfig(struct uart_8250_port *up, unsigned int probeflags)
 	if (!up->port.iobase && !up->port.mapbase && !up->port.membase)
 		return;
 
-	DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04x, 0x%p): ",
+	DEBUG_AUTOCONF("ttyS%d: autoconf (0x%04lx, 0x%p): ",
 		       serial_index(&up->port), up->port.iobase, up->port.membase);
 
 	/*
diff --git a/drivers/serial/8250_pci.c b/drivers/serial/8250_pci.c
index 42e8550cd2b..b2d65b208e5 100644
--- a/drivers/serial/8250_pci.c
+++ b/drivers/serial/8250_pci.c
@@ -2383,7 +2383,7 @@ pciserial_init_ports(struct pci_dev *dev, const struct pciserial_board *board)
 			break;
 
 #ifdef SERIAL_DEBUG_PCI
-		printk(KERN_DEBUG "Setup PCI port: port %x, irq %d, type %d\n",
+		printk(KERN_DEBUG "Setup PCI port: port %lx, irq %d, type %d\n",
 		       serial_port.iobase, serial_port.irq, serial_port.iotype);
 #endif