diff --git a/drivers/rtc/rtc-at91sam9.c b/drivers/rtc/rtc-at91sam9.c
index 99732e6f8c3b295a9647c5d61caf4779b31d6adf..7418a763ce5202b37f96b0cf26863400aa953982 100644
--- a/drivers/rtc/rtc-at91sam9.c
+++ b/drivers/rtc/rtc-at91sam9.c
@@ -375,6 +375,7 @@ static int at91_rtc_probe(struct platform_device *pdev)
 	if (!rtc)
 		return -ENOMEM;
 
+	spin_lock_init(&rtc->lock);
 	rtc->irq = irq;
 
 	/* platform setup code should have handled this; sigh */