diff --git a/bsp/gd32/arm/libraries/gd32_drivers/drv_rtc.c b/bsp/gd32/arm/libraries/gd32_drivers/drv_rtc.c
index a812cfea7d..2937f408c2 100644
--- a/bsp/gd32/arm/libraries/gd32_drivers/drv_rtc.c
+++ b/bsp/gd32/arm/libraries/gd32_drivers/drv_rtc.c
@@ -102,14 +102,14 @@ static int rt_hw_rtc_init(void)
     rcu_bkp_reset_enable();
     rcu_bkp_reset_disable();
     rcu_periph_clock_enable(RCU_RTC);
-#ifdef BSP_RTC_USING_LSE
+#if defined(BSP_RTC_USING_LSE)
     rcu_osci_on(RCU_LXTAL);
     if (SUCCESS == rcu_osci_stab_wait(RCU_LXTAL))
     {
         /* set lxtal as rtc clock source */
         rcu_rtc_clock_config(RCU_RTCSRC_LXTAL);
     }
-#elif def BSP_RTC_USING_LSI
+#elif defined(BSP_RTC_USING_LSI)
     rcu_osci_on(RCU_IRC40K);
     if (SUCCESS == rcu_osci_stab_wait(RCU_IRC40K))
     {