diff --git a/collects/frtime/gui/fred.rkt b/collects/frtime/gui/fred.rkt
index 9628f29439..23e3fef7d3 100644
--- a/collects/frtime/gui/fred.rkt
+++ b/collects/frtime/gui/fred.rkt
@@ -1,8 +1,8 @@
 (module fred frtime
   (require "mixin-macros.rkt"
            "aux-mixin-macros.rkt"
-           mzlib/class
-           mzlib/string
+           racket/class
+           racket/string
            texpict/mrpict
            (all-except mred send-event)
            framework)
@@ -18,7 +18,7 @@
         ""
         (if (string? itm)
             itm
-            (expr->string itm))))
+            (number->string itm))))
   
   
   ;; adding assumed methods
@@ -323,6 +323,6 @@
   
   
   (provide (all-defined)
-           (all-from mzlib/class)
+           (all-from racket/class)
            (all-from "mixin-macros.rkt")
            (all-from "aux-mixin-macros.rkt")))
diff --git a/collects/frtime/gui/mixin-macros.rkt b/collects/frtime/gui/mixin-macros.rkt
index 11e2bf77b6..f4a2bfd715 100644
--- a/collects/frtime/gui/mixin-macros.rkt
+++ b/collects/frtime/gui/mixin-macros.rkt
@@ -1,5 +1,5 @@
 (module mixin-macros frtime
-  (require mzlib/class)  
+  (require racket/class)  
   
   (define-syntax events->callbacks
     (lambda (stx)
diff --git a/collects/frtime/gui/simple.rkt b/collects/frtime/gui/simple.rkt
index 20c4b8c1d4..50521a8c15 100644
--- a/collects/frtime/gui/simple.rkt
+++ b/collects/frtime/gui/simple.rkt
@@ -1,7 +1,7 @@
 (module simple frtime
   
   (require "fred.rkt"
-           mzlib/class
+           racket/class
            (rename mred frame% frame%))
   
   (define widget (lambda (x) x))
@@ -50,4 +50,4 @@
   
   (provide (all-defined)
            (all-from "fred.rkt")
-           (all-from mzlib/class)))
+           (all-from racket/class)))