diff --git a/typed-racket-lib/typed/racket/unit.rkt b/typed-racket-lib/typed/racket/unit.rkt
index e36de3c6..ca42413f 100644
--- a/typed-racket-lib/typed/racket/unit.rkt
+++ b/typed-racket-lib/typed/racket/unit.rkt
@@ -15,9 +15,11 @@
                     unit-from-context
                     define-unit-from-context)
          typed-racket/base-env/unit-prims
+         typed-racket/base-env/base-types-extra
          typed-racket/base-env/signature-prims)
 
 (provide define-signature
+         Unit
          unit
          invoke-unit
          invoke-unit/infer