diff --git a/drivers/note/note_driver.c b/drivers/note/note_driver.c
index fc079c11fd..66b4f01428 100644
--- a/drivers/note/note_driver.c
+++ b/drivers/note/note_driver.c
@@ -177,7 +177,10 @@ FAR static struct note_driver_s *
 static struct note_taskname_s g_note_taskname;
 #endif
 
+#if defined(CONFIG_SCHED_INSTRUMENTATION_FILTER) || \
+    (CONFIG_DRIVERS_NOTE_TASKNAME_BUFSIZE > 0)
 static spinlock_t g_note_lock;
+#endif
 
 /****************************************************************************
  * Private Functions
@@ -1892,7 +1895,7 @@ void sched_note_filter_irq(FAR struct note_filter_irq_s *oldf,
  *
  ****************************************************************************/
 
-#  ifdef CONFIG_SCHED_INSTRUMENTATION_DUMP
+#ifdef CONFIG_SCHED_INSTRUMENTATION_DUMP
 void sched_note_filter_tag(FAR struct note_filter_tag_s *oldf,
                            FAR struct note_filter_tag_s *newf)
 {
@@ -1916,7 +1919,7 @@ void sched_note_filter_tag(FAR struct note_filter_tag_s *oldf,
 
   spin_unlock_irqrestore_wo_note(&g_note_lock, falgs);
 }
-#  endif
+#endif
 
 #endif /* CONFIG_SCHED_INSTRUMENTATION_FILTER */