diff --git a/sys/kern/sched_ule.c b/sys/kern/sched_ule.c
index ea96934a6b5..d394d9f56ae 100644
--- a/sys/kern/sched_ule.c
+++ b/sys/kern/sched_ule.c
@@ -365,7 +365,7 @@ SDT_PROBE_DEFINE2(sched, , , surrender, "struct thread *",
  * the maximum randomness.
  */
 static uint32_t
-sched_random() 
+sched_random(void) 
 {
 	uint32_t *rndptr;