diff --git a/src/clock/clock.c b/src/clock/clock.c
index c1fdc02d5ae59eb8b36a3d743d02f8eb23383a89..a79bcc73d008258d5e89b70d67226fc09db245d6 100644
--- a/src/clock/clock.c
+++ b/src/clock/clock.c
@@ -995,7 +995,6 @@ vlc_clock_t *vlc_clock_main_CreateMaster(vlc_clock_main_t *main_clock,
 
 vlc_clock_t *vlc_clock_main_CreateInputMaster(vlc_clock_main_t *main_clock)
 {
-    vlc_mutex_assert(&main_clock->lock);
     struct vlc_clock_context *ctx = main_clock->context;
 
     /* The master has always the 0 priority */