diff --git a/drivers/acpi/event.c b/drivers/acpi/event.c
index 92e59f45329b..df38f3c94861 100644
--- a/drivers/acpi/event.c
+++ b/drivers/acpi/event.c
@@ -7,6 +7,8 @@
  *
  */
 
+#define pr_fmt(fmt) "ACPI: " fmt
+
 #include <linux/spinlock.h>
 #include <linux/export.h>
 #include <linux/proc_fs.h>
@@ -173,8 +175,8 @@ static int __init acpi_event_init(void)
 	/* create genetlink for acpi event */
 	error = acpi_event_genetlink_init();
 	if (error)
-		printk(KERN_WARNING PREFIX
-		       "Failed to create genetlink family for ACPI event\n");
+		pr_warn("Failed to create genetlink family for ACPI event\n");
+
 	return 0;
 }