diff --git a/src/or/scheduler.c b/src/or/scheduler.c
index 7d852606e6..d965f3b845 100644
--- a/src/or/scheduler.c
+++ b/src/or/scheduler.c
@@ -168,6 +168,9 @@ scheduler_free_all(void)
 static void
 scheduler_evt_callback(evutil_socket_t fd, short events, void *arg)
 {
+  (void)fd;
+  (void)events;
+  (void)arg;
   log_debug(LD_SCHED, "Scheduler event callback called");
 
   tor_assert(run_sched_ev);