diff --git a/hyphenate/hyphenate/fr.rkt b/hyphenate/hyphenate/fr.rkt
index e3d4d639..6aa78a98 100644
--- a/hyphenate/hyphenate/fr.rkt
+++ b/hyphenate/hyphenate/fr.rkt
@@ -1,3 +1,2 @@
-#lang racket/base
-(require "private/bootstrap.rkt")
-(build-main fr)
\ No newline at end of file
+#lang s-exp "private/bootstrap.rkt"
+fr
\ No newline at end of file
diff --git a/hyphenate/hyphenate/private/bootstrap.rkt b/hyphenate/hyphenate/private/bootstrap.rkt
index a5abdd65..a2aa9939 100644
--- a/hyphenate/hyphenate/private/bootstrap.rkt
+++ b/hyphenate/hyphenate/private/bootstrap.rkt
@@ -7,7 +7,7 @@
          (only-in xml xexpr/c)
          (prefix-in core: hyphenate/private/core))
 
-(provide build-main)
+(provide (rename-out [mb #%module-begin]) #%top-interaction #%top #%datum #%app)
 
 ;; An exception-word is a string of word characters or hyphens.
 (define (exception-word? x)
@@ -53,17 +53,19 @@
     (write-to-file (dynamic-require module-path id-sym) cache-path #:exists 'replace))
   (file->value cache-path))
 
-(define-syntax (build-main stx)
+(define-syntax (mb stx)
   (syntax-case stx () 
     [(_ DIR)
-     (let ([dir (symbol->string (syntax->datum #'DIR))])
-       (with-syntax ([PATTERNS-PATH (path->string (build-path dir "patterns.rkt"))]
+     (let* ([base (let-values ([(base name _) (split-path (syntax-source stx))])
+                    base)]
+            [dir (build-path base (symbol->string (syntax->datum #'DIR)))])
+       (with-syntax ([PATTERNS-PATH (build-path dir "patterns.rkt")]
                      [PATTERN-CACHE-PATH (build-path dir "compiled" "patterns-cache.rktd")]
-                     [EXCEPTIONS-PATH (path->string (build-path dir "exceptions.rkt"))]
+                     [EXCEPTIONS-PATH  (build-path dir "exceptions.rkt")]
                      [EXCEPTIONS-CACHE-PATH (build-path dir "compiled" "exceptions-cache.rktd")]
                      [PATTERNS-ID 'patterns]
                      [EXCEPTIONS-ID 'exceptions])
-         #'(begin
+         #'(#%module-begin
              (define PATTERNS-ID (load-from-cache-if-possible PATTERNS-PATH PATTERN-CACHE-PATH 'PATTERNS-ID))
              ;; a file-cached hash is immutable, so convert it
              (define EXCEPTIONS-ID (make-hash (hash->list (load-from-cache-if-possible EXCEPTIONS-PATH EXCEPTIONS-CACHE-PATH 'EXCEPTIONS-ID))))
diff --git a/hyphenate/hyphenate/us.rkt b/hyphenate/hyphenate/us.rkt
index 2e031840..5978a3d8 100644
--- a/hyphenate/hyphenate/us.rkt
+++ b/hyphenate/hyphenate/us.rkt
@@ -1,3 +1,2 @@
-#lang racket/base
-(require "private/bootstrap.rkt")
-(build-main us)
\ No newline at end of file
+#lang s-exp "private/bootstrap.rkt"
+us
\ No newline at end of file