diff --git a/src/sched.h b/src/sched.h
index 27779a1..f8138c0 100644
--- a/src/sched.h
+++ b/src/sched.h
@@ -57,6 +57,6 @@ struct Event {
 void evenq (Event *);
 void evdeq (Event *);
 void SetTimeout (Event *, int);
-void sched (void);
+void sched (void) __attribute__((__noreturn__));
 
 #endif /* SCREEN_SCHED_H */