diff --git a/language/prescheme/spec.scm b/language/prescheme/spec.scm
index 021ab55..2a8d27b 100644
--- a/language/prescheme/spec.scm
+++ b/language/prescheme/spec.scm
@@ -1,18 +1,23 @@
 ;;; Copyright 2022 Andrew Whatson
 
 (define-module (language prescheme spec)
-  #:use-module (system base language))
+  #:use-module (system base language)
+  #:use-module (language scheme compile-tree-il)
+  #:use-module (language scheme decompile-tree-il))
 
 (define (reader port env)
   (read-syntax port))
 
 (define (default-environment)
   (let ((m (make-module)))
-    (module-use! m (resolve-module '(language pre-scheme core)))
+    (module-use! m (resolve-module '(language prescheme core)))
     m))
 
 (define-language prescheme
   #:title "Pre-Scheme"
   #:reader reader
   #:printer write
+  #:compilers   `((tree-il . ,compile-tree-il))
+  #:decompilers `((tree-il . ,decompile-tree-il))
+  #:evaluator   (lambda (x module) (primitive-eval x))
   #:make-default-environment default-environment)