diff --git a/arch/arm/src/sam34/sam_rtc.c b/arch/arm/src/sam34/sam_rtc.c
index a375830e312..3dd26c40b4e 100644
--- a/arch/arm/src/sam34/sam_rtc.c
+++ b/arch/arm/src/sam34/sam_rtc.c
@@ -657,8 +657,8 @@ int sam_rtc_setalarm(const struct timespec *tp, alarmcb_t callback)
 
   /* Is there already something waiting on the ALARM? */
 
-  flags = spin_lock_irqsave(&g_rtc_lock);
-  sched_lock();
+  flags = spin_lock_irqsave_nopreempt(&g_rtc_lock);
+
   if (g_alarmcb == NULL)
     {
       /* No.. Save the callback function pointer */
@@ -736,8 +736,7 @@ int sam_rtc_setalarm(const struct timespec *tp, alarmcb_t callback)
       ret = OK;
     }
 
-  spin_unlock_irqrestore(&g_rtc_lock, flags);
-  sched_unlock();
+  spin_unlock_irqrestore_nopreempt(&g_rtc_lock, flags);
   return ret;
 }
 #endif