diff --git a/sched/clock/clock_adjtime.c b/sched/clock/clock_adjtime.c
index c497a773f72..a87e0f1e926 100644
--- a/sched/clock/clock_adjtime.c
+++ b/sched/clock/clock_adjtime.c
@@ -36,6 +36,7 @@
 
 #include <nuttx/irq.h>
 #include <nuttx/arch.h>
+#include <nuttx/spinlock.h>
 
 #include "clock/clock.h"