diff --git a/src/clock.c b/src/clock.c
index 4d52dfb..3e3e309 100644
--- a/src/clock.c
+++ b/src/clock.c
@@ -28,7 +28,7 @@ struct UCoreClock uc_time_clock = {
     .now = uc_time_now,
 };
 
-static void uc_cached_clock_now(struct UCoreClock *uclock UNUSED,
+static void uc_cached_clock_now(struct UCoreClock *uclock,
                                     struct timeval *tv)
 {
     struct UCoreCachedClock *cached_clock;