diff --git a/src/system/libroot/os/scheduler.c b/src/system/libroot/os/scheduler.c
index 9bae2228b1..4dc16b6225 100644
--- a/src/system/libroot/os/scheduler.c
+++ b/src/system/libroot/os/scheduler.c
@@ -32,6 +32,9 @@ static struct {
 	{(uint32)-1, -1}
 };
 
+status_t __set_scheduler_mode(int32 mode);
+int32 __get_scheduler_mode(void);
+
 
 int32
 suggest_thread_priority(uint32 what, int32 period, bigtime_t jitter,