diff --git a/drivers/rtc/interface.c b/drivers/rtc/interface.c
index b6bf57f..601b053 100644
--- a/drivers/rtc/interface.c
+++ b/drivers/rtc/interface.c
@@ -688,7 +688,7 @@
 	int err = 0;
 	unsigned long flags;
 
-	if (freq <= 0)
+	if (freq <= 0 || freq > 5000)
 		return -EINVAL;
 
 	spin_lock_irqsave(&rtc->irq_task_lock, flags);