diff --git a/sched/sched/sched_processtimer.c b/sched/sched/sched_processtimer.c
index 6e56f7c39f..aaeba021ea 100644
--- a/sched/sched/sched_processtimer.c
+++ b/sched/sched/sched_processtimer.c
@@ -114,7 +114,7 @@ static inline void nxsched_process_scheduler(void)
   int i;
 
   /* If we are running on a single CPU architecture, then we know interrupts
-   * a disabled an there is no need to explicitly call
+   * are disabled and there is no need to explicitly call
    * enter_critical_section().  However, in the SMP case,
    * enter_critical_section() does much more than just disable interrupts on
    * the local CPU; it also manages spinlocks to assure the stability of the
diff --git a/sched/sched/sched_timerexpiration.c b/sched/sched/sched_timerexpiration.c
index 409a9a566a..9b43c54e31 100644
--- a/sched/sched/sched_timerexpiration.c
+++ b/sched/sched/sched_timerexpiration.c
@@ -280,7 +280,7 @@ static uint32_t nxsched_process_scheduler(uint32_t ticks, bool noswitches)
   int i;
 
   /* If we are running on a single CPU architecture, then we know interrupts
-   * a disabled an there is no need to explicitly call
+   * are disabled and there is no need to explicitly call
    * enter_critical_section().  However, in the SMP case,
    * enter_critical_section() does much more than just disable interrupts on
    * the local CPU; it also manages spinlocks to assure the stability of the