diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index bcd7d0e..5ca1d80 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -227,7 +227,7 @@
 	if (strict_strtoul(arg, 16, &base))
 		return -EINVAL;
 
-	printk(KERN_INFO "PMTMR IOPort override: 0x%04x -> 0x%04x\n",
+	printk(KERN_INFO "PMTMR IOPort override: 0x%04x -> 0x%04lx\n",
 	       (unsigned int)pmtmr_ioport, base);
 	pmtmr_ioport = base;