diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
index 16e0f9d..394ae89 100644
--- a/drivers/acpi/pci_link.c
+++ b/drivers/acpi/pci_link.c
@@ -43,6 +43,8 @@
 #include <acpi/acpi_bus.h>
 #include <acpi/acpi_drivers.h>
 
+#define PREFIX "ACPI: "
+
 #define _COMPONENT			ACPI_PCI_COMPONENT
 ACPI_MODULE_NAME("pci_link");
 #define ACPI_PCI_LINK_CLASS		"pci_irq_routing"