diff --git a/include/acpi/processor.h b/include/acpi/processor.h
index 6ee4a69412de..2976a6d0c54f 100644
--- a/include/acpi/processor.h
+++ b/include/acpi/processor.h
@@ -425,8 +425,6 @@ int acpi_processor_power_state_has_changed(struct acpi_processor *pr);
 int acpi_processor_hotplug(struct acpi_processor *pr);
 void acpi_processor_register_idle_driver(void);
 void acpi_processor_unregister_idle_driver(void);
-int acpi_processor_ffh_lpi_probe(unsigned int cpu);
-int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
 #endif /* CONFIG_ACPI_PROCESSOR_IDLE */
 
 /* in processor_thermal.c */
@@ -449,6 +447,11 @@ static inline void acpi_thermal_cpufreq_exit(struct cpufreq_policy *policy)
 }
 #endif	/* CONFIG_CPU_FREQ */
 
+#ifdef CONFIG_ACPI_PROCESSOR_IDLE
+extern int acpi_processor_ffh_lpi_probe(unsigned int cpu);
+extern int acpi_processor_ffh_lpi_enter(struct acpi_lpi_state *lpi);
+#endif
+
 void acpi_processor_init_invariance_cppc(void);
 
 #endif