diff --git a/plat/socionext/synquacer/drivers/scp/sq_scmi.c b/plat/socionext/synquacer/drivers/scp/sq_scmi.c
index e2013cc55..0e99256ac 100644
--- a/plat/socionext/synquacer/drivers/scp/sq_scmi.c
+++ b/plat/socionext/synquacer/drivers/scp/sq_scmi.c
@@ -189,6 +189,11 @@ void __dead2 sq_scmi_system_off(int state)
 /*
  * Helper function to reset the system via SCMI.
  */
+void __dead2 sq_scmi_sys_shutdown(void)
+{
+	sq_scmi_system_off(SCMI_SYS_PWR_SHUTDOWN);
+}
+
 void __dead2 sq_scmi_sys_reboot(void)
 {
 	sq_scmi_system_off(SCMI_SYS_PWR_COLD_RESET);
diff --git a/plat/socionext/synquacer/include/sq_common.h b/plat/socionext/synquacer/include/sq_common.h
index a9858229f..b09d22a03 100644
--- a/plat/socionext/synquacer/include/sq_common.h
+++ b/plat/socionext/synquacer/include/sq_common.h
@@ -45,6 +45,7 @@ void sq_mmap_setup(uintptr_t total_base, size_t total_size,
 /* SCMI API for power management by SCP */
 void sq_scmi_off(const struct psci_power_state *target_state);
 void sq_scmi_on(u_register_t mpidr);
+void __dead2 sq_scmi_sys_shutdown(void);
 void __dead2 sq_scmi_sys_reboot(void);
 void __dead2 sq_scmi_system_off(int state);
 /* SCMI API for vendor specific protocol */
diff --git a/plat/socionext/synquacer/sq_psci.c b/plat/socionext/synquacer/sq_psci.c
index 4168df9da..3062f6318 100644
--- a/plat/socionext/synquacer/sq_psci.c
+++ b/plat/socionext/synquacer/sq_psci.c
@@ -113,6 +113,9 @@ void sq_pwr_domain_off(const psci_power_state_t *target_state)
 
 void __dead2 sq_system_off(void)
 {
+#if SQ_USE_SCMI_DRIVER
+	sq_scmi_sys_shutdown();
+#else
 	volatile uint32_t *gpio = (uint32_t *)PLAT_SQ_GPIO_BASE;
 
 	/* set PD[9] high to power off the system */
@@ -139,6 +142,7 @@ void __dead2 sq_system_off(void)
 	wfi();
 	ERROR("SQ System Off: operation not handled.\n");
 	panic();
+#endif
 }
 
 void __dead2 sq_system_reset(void)