diff --git a/typed-racket-test/unit-tests/typecheck-tests.rkt b/typed-racket-test/unit-tests/typecheck-tests.rkt
index 2d300b48..2f72f53e 100644
--- a/typed-racket-test/unit-tests/typecheck-tests.rkt
+++ b/typed-racket-test/unit-tests/typecheck-tests.rkt
@@ -1551,6 +1551,8 @@
 
         (tc-e (directory-list) (-lst -Path))
         (tc-e (directory-list "tmp") (-lst -Path))
+        (tc-e (directory-list #:build? #f) (-lst -Path))
+        (tc-e (directory-list "tmp" #:build? "yes") (-lst -Path))
         (tc-e (filesystem-root-list) (-lst -Path))