diff --git a/drivers/watchdog/wdt_ite_it8xxx2.c b/drivers/watchdog/wdt_ite_it8xxx2.c
index 32750d7690b..2bff9c41bb4 100644
--- a/drivers/watchdog/wdt_ite_it8xxx2.c
+++ b/drivers/watchdog/wdt_ite_it8xxx2.c
@@ -213,23 +213,23 @@ static void wdt_it8xxx2_isr(const struct device *dev)
 		data->callback(dev, 0);
 	}
 
-#ifdef CONFIG_WDT_ITE_REDUCE_WARNING_LEADING_TIME
-	/*
-	 * Once warning timer triggered: if watchdog timer isn't reloaded,
-	 * then we will reduce interval of warning timer to 30ms to print
-	 * more warning messages before watchdog reset.
-	 */
-	if (!wdt_warning_fired) {
-		uint16_t cnt0 = WARNING_TIMER_PERIOD_MS_TO_1024HZ_COUNT(30);
+	if (IS_ENABLED(CONFIG_WDT_ITE_REDUCE_WARNING_LEADING_TIME)) {
+		/*
+		 * Once warning timer triggered: if watchdog timer isn't reloaded,
+		 * then we will reduce interval of warning timer to 30ms to print
+		 * more warning messages before watchdog reset.
+		 */
+		if (!wdt_warning_fired) {
+			uint16_t cnt0 = WARNING_TIMER_PERIOD_MS_TO_1024HZ_COUNT(30);
 
-		/* pre-warning timer1 is 16-bit counter down timer */
-		inst->ET1CNTLHR = (cnt0 >> 8) & 0xff;
-		inst->ET1CNTLLR = cnt0 & 0xff;
+			/* pre-warning timer1 is 16-bit counter down timer */
+			inst->ET1CNTLHR = (cnt0 >> 8) & 0xff;
+			inst->ET1CNTLLR = cnt0 & 0xff;
 
-		/* clear pre-warning timer1 interrupt status */
-		ite_intc_isr_clear(DT_INST_IRQN(0));
+			/* clear pre-warning timer1 interrupt status */
+			ite_intc_isr_clear(DT_INST_IRQN(0));
+		}
 	}
-#endif
 	wdt_warning_fired++;
 
 	LOG_DBG("WDT ISR");