diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index c6fa5e0..529d035 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -364,6 +364,8 @@
 acpi_handle acpi_get_pci_rootbridge_handle(unsigned int, unsigned int);
 #define DEVICE_ACPI_HANDLE(dev) ((acpi_handle)((dev)->archdata.acpi_handle))
 
+int acpi_pm_device_sleep_state(struct device *, int, int *);
+
 #endif				/* CONFIG_ACPI */
 
 #endif /*__ACPI_BUS_H__*/