diff --git a/sched/clock/clock_adjtime.c b/sched/clock/clock_adjtime.c
index c7028f4fd83..a46924b7033 100644
--- a/sched/clock/clock_adjtime.c
+++ b/sched/clock/clock_adjtime.c
@@ -115,8 +115,7 @@ static int adjtime_start(long long adjust_usec)
       ppb = -ppb_limit;
     }
 
-  flags = spin_lock_irqsave(&g_adjtime_lock);
-  sched_lock();
+  flags = spin_lock_irqsave_nopreempt(&g_adjtime_lock);
 
   /* Set new adjustment */
 
@@ -142,8 +141,7 @@ static int adjtime_start(long long adjust_usec)
       wd_cancel(&g_adjtime_wdog);
     }
 
-  spin_unlock_irqrestore(&g_adjtime_lock, flags);
-  sched_unlock();
+  spin_unlock_irqrestore_nopreempt(&g_adjtime_lock, flags);
 
   return ret;
 }