diff --git a/include/bl31/services/psci.h b/include/bl31/services/psci.h
index acf0786..95e7780 100644
--- a/include/bl31/services/psci.h
+++ b/include/bl31/services/psci.h
@@ -265,6 +265,8 @@
 	void (*pwr_domain_on_finish)(const psci_power_state_t *target_state);
 	void (*pwr_domain_suspend_finish)(
 				const psci_power_state_t *target_state);
+	void (*pwr_domain_pwr_down_wfi)(
+				const psci_power_state_t *target_state) __dead2;
 	void (*system_off)(void) __dead2;
 	void (*system_reset)(void) __dead2;
 	int (*validate_power_state)(unsigned int power_state,