diff --git a/collects/tests/macro-debugger/tests/regression.ss b/collects/tests/macro-debugger/tests/regression.ss
index e483f25..258e34f 100644
--- a/collects/tests/macro-debugger/tests/regression.ss
+++ b/collects/tests/macro-debugger/tests/regression.ss
@@ -45,8 +45,8 @@
     (test-case "lift in module"
       (check-pred syntax?
                   (stx/hide-none
-                   (trace '(module m mzscheme 
-                             (require (lib "etc.ss"))
+                   (trace '(module m mzscheme
+                             (require mzlib/etc)
                              (define x (begin-lifted 1)))))))
 
     ;; Fixed 2/9/2007: defstx in brules misparsed & mishandled
diff --git a/collects/tests/macro-debugger/tests/syntax-errors.ss b/collects/tests/macro-debugger/tests/syntax-errors.ss
index 10b5fdb..57c9721 100644
--- a/collects/tests/macro-debugger/tests/syntax-errors.ss
+++ b/collects/tests/macro-debugger/tests/syntax-errors.ss
@@ -18,9 +18,9 @@
            #:error-step)
    (testKE (#%require 5)
            #:error-step)
-   (testKE (#%require (prefix (lib "list.ss")))
+   (testKE (#%require (prefix mzlib/list))
            #:error-step)
-   (testKE (#%require (prefix 5 (lib "list.ss")))
+   (testKE (#%require (prefix 5 mzlib/list))
            #:error-step)]
   [#:suite
    "Definitions"