diff --git a/collects/frtime/core/contract.rkt b/collects/frtime/core/contract.rkt
index d5e3d9f583..b97b17cd7c 100644
--- a/collects/frtime/core/contract.rkt
+++ b/collects/frtime/core/contract.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 
 (define-syntax-rule (provide/contract* [id ctrct] ...)
   #;(provide/contract [id ctrct] ...)
diff --git a/collects/frtime/core/dv.rkt b/collects/frtime/core/dv.rkt
index d61cd7140f..4b9ba467b6 100644
--- a/collects/frtime/core/dv.rkt
+++ b/collects/frtime/core/dv.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require "contract.rkt")
 
 (define-struct dv (vec-length next-avail-pos vec) #:mutable)
diff --git a/collects/frtime/core/erl.rkt b/collects/frtime/core/erl.rkt
index 726a161e62..2849650c2d 100644
--- a/collects/frtime/core/erl.rkt
+++ b/collects/frtime/core/erl.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require "match.rkt"
          "contract.rkt"
          #;"sema-mailbox.rkt"
diff --git a/collects/frtime/core/frp.rkt b/collects/frtime/core/frp.rkt
index ff30353e7a..5c50d8a503 100644
--- a/collects/frtime/core/frp.rkt
+++ b/collects/frtime/core/frp.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require (only-in mzlib/etc 
                   identity nor)
          "contract.rkt"
diff --git a/collects/frtime/core/heap.rkt b/collects/frtime/core/heap.rkt
index 4559867687..0f23a7feb3 100644
--- a/collects/frtime/core/heap.rkt
+++ b/collects/frtime/core/heap.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require "dv.rkt"
          "contract.rkt")
 
diff --git a/collects/frtime/core/mailbox.rkt b/collects/frtime/core/mailbox.rkt
index 5ef296f9c0..5f375d16f4 100644
--- a/collects/frtime/core/mailbox.rkt
+++ b/collects/frtime/core/mailbox.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require "contract.rkt"
          "match.rkt"
          scheme/async-channel)
diff --git a/collects/frtime/core/match.rkt b/collects/frtime/core/match.rkt
index 45d196babe..a2b6d71741 100644
--- a/collects/frtime/core/match.rkt
+++ b/collects/frtime/core/match.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 
 (define-struct a-match-fail ())
 (define match-fail (make-a-match-fail))
diff --git a/collects/frtime/core/sema-mailbox.rkt b/collects/frtime/core/sema-mailbox.rkt
index a97639af8d..44b1e72e75 100644
--- a/collects/frtime/core/sema-mailbox.rkt
+++ b/collects/frtime/core/sema-mailbox.rkt
@@ -1,4 +1,4 @@
-#lang scheme
+#lang racket
 (require "match.rkt"
          "contract.rkt")
 
diff --git a/collects/frtime/gui/aux-mixin-macros.rkt b/collects/frtime/gui/aux-mixin-macros.rkt
index 8a84b550d9..dd7515a15f 100644
--- a/collects/frtime/gui/aux-mixin-macros.rkt
+++ b/collects/frtime/gui/aux-mixin-macros.rkt
@@ -1,6 +1,6 @@
 (module aux-mixin-macros frtime
   (require "mixin-macros.rkt")
-  (require mzlib/class)
+  (require racket/class)
 
   
   ;; consider taking out setter