diff --git a/scsh/scsh-interfaces.scm b/scsh/scsh-interfaces.scm
index 28a31b7..bd87b75 100644
--- a/scsh/scsh-interfaces.scm
+++ b/scsh/scsh-interfaces.scm
@@ -1038,7 +1038,8 @@
 	  next-sigevent-set
 	  next-sigevent/no-wait
 	  next-sigevent-set/no-wait
-	  sigevent-type))
+	  sigevent-type
+	  schedule-timer-interrupt!))
 
 
 (define-interface low-interrupt-interface