diff --git a/arch/sim/src/sim/up_oneshot.c b/arch/sim/src/sim/up_oneshot.c
index 4b5a2cb5575..0e87a37501e 100644
--- a/arch/sim/src/sim/up_oneshot.c
+++ b/arch/sim/src/sim/up_oneshot.c
@@ -288,8 +288,10 @@ static int sim_cancel(FAR struct oneshot_lowerhalf_s *lower,
 static int sim_current(FAR struct oneshot_lowerhalf_s *lower,
                        FAR struct timespec *ts)
 {
+#ifdef CONFIG_DEBUG_ASSERTIONS
   FAR struct sim_oneshot_lowerhalf_s *priv =
     (FAR struct sim_oneshot_lowerhalf_s *)lower;
+#endif
 
   DEBUGASSERT(priv != NULL && ts != NULL);