diff --git a/collects/frtime/core/mailbox.rkt b/collects/frtime/core/mailbox.rkt
index 5f375d16f4..228fd94360 100644
--- a/collects/frtime/core/mailbox.rkt
+++ b/collects/frtime/core/mailbox.rkt
@@ -1,7 +1,7 @@
 #lang racket
 (require "contract.rkt"
          "match.rkt"
-         scheme/async-channel)
+         racket/async-channel)
 
 ; XXX More efficient structure
 (define (snoc x l) (append l (list x)))