diff --git a/pkgs/racket-test-core/tests/racket/testing.rktl b/pkgs/racket-test-core/tests/racket/testing.rktl
index a04c9cdc90..e72d3eda60 100644
--- a/pkgs/racket-test-core/tests/racket/testing.rktl
+++ b/pkgs/racket-test-core/tests/racket/testing.rktl
@@ -209,7 +209,7 @@ transcript.
     [(expr) (error-test expr exn:application:type?)]
     [(expr exn-type?) (thunk-error-test (lambda () (eval expr)) expr exn-type?)]))
 
-(require (only-in racket [lambda err:mz:lambda])) ; so err/rt-test works with beginner.rktl
+(require (only-in racket/base [lambda err:mz:lambda])) ; so err/rt-test works with beginner.rktl
 (define-syntax err/rt-test
   (lambda (stx)
     (syntax-case stx ()