diff --git a/plat/socionext/synquacer/sq_psci.c b/plat/socionext/synquacer/sq_psci.c
index 0c97fcf79..4168df9da 100644
--- a/plat/socionext/synquacer/sq_psci.c
+++ b/plat/socionext/synquacer/sq_psci.c
@@ -97,6 +97,14 @@ static void sq_power_down_common(const psci_power_state_t *target_state)
 void sq_pwr_domain_off(const psci_power_state_t *target_state)
 {
 #if SQ_USE_SCMI_DRIVER
+	/* Prevent interrupts from spuriously waking up this cpu */
+	sq_gic_cpuif_disable();
+
+	/* Cluster is to be turned off, so disable coherency */
+	if (SQ_CLUSTER_PWR_STATE(target_state) == SQ_LOCAL_STATE_OFF) {
+		plat_sq_interconnect_exit_coherency();
+	}
+
 	sq_scmi_off(target_state);
 #else
 	sq_power_down_common(target_state);