diff --git a/sched/sched/sched_note.c b/sched/sched/sched_note.c
index 0b9146caced..59b7f7abf7a 100644
--- a/sched/sched/sched_note.c
+++ b/sched/sched/sched_note.c
@@ -86,12 +86,14 @@ static struct note_filter_s g_note_filter =
     }
 };
 
+#ifdef CONFIG_SCHED_INSTRUMENTATION_IRQHANDLER
 #ifdef CONFIG_SMP
 static unsigned int g_note_disabled_irq_nest[CONFIG_SMP_NCPUS];
 #else
 static unsigned int g_note_disabled_irq_nest[1];
 #endif
 #endif
+#endif
 
 /****************************************************************************
  * Private Functions