diff --git a/collects/mzlib/defmacro.rkt b/collects/mzlib/defmacro.rkt
index 8f0e8d4..1e893e9 100644
--- a/collects/mzlib/defmacro.rkt
+++ b/collects/mzlib/defmacro.rkt
@@ -1,72 +1,8 @@
+#lang racket/base
 
-(module defmacro mzscheme
-  (require-for-syntax syntax/stx
-		      "private/dmhelp.rkt")
+;; deprecated library, see racket/defmacro
+;;
+;; for legacy use only
 
-  (provide define-macro
-	   defmacro)
-
-  (define-syntax define-macro
-    (lambda (stx)
-      (syntax-case stx ()
-	[(_ (name . args) proc0 proc ...)
-	 (begin
-	   (unless (identifier? (syntax name))
-	     (raise-syntax-error
-	      #f
-	      "expected an identifier for the macro name"
-	      stx
-	      (syntax name)))
-	   (let loop ([args (syntax args)])
-	     (cond
-	      [(stx-null? args) 'ok]
-	      [(identifier? args) 'ok]
-	      [(stx-pair? args)
-	       (unless (identifier? (stx-car args))
-		 (raise-syntax-error
-		  #f
-		  "expected an identifier for a macro argument"
-		  stx
-		  (stx-car args)))
-	       (loop (stx-cdr args))]
-	      [else (raise-syntax-error
-		     #f
-		     "not a valid argument sequence after the macro name"
-		     stx)]))
-	   (syntax
-	    (define-macro name (lambda args proc0 proc ...))))]
-	[(_ name proc)
-	 (begin
-	   (unless (identifier? (syntax name))
-	     (raise-syntax-error
-	      #f
-	      "expected an identifier for the macro name"
-	      stx
-	      (syntax name)))
-	   (syntax
-	    (define-syntax name
-	      (let ([p proc])
-		(unless (procedure? p)
-		  (raise-type-error 
-		   'define-macro 
-		   "procedure (arity 1)"
-		   p))
-		(lambda (stx)
-		  (let ([l (syntax->list stx)])
-		    (unless (and l (procedure-arity-includes? p (sub1 (length l))))
-		      (raise-syntax-error
-		       #f
-		       "bad form"
-		       stx))
-		    (let ([ht (make-hash-table)])
-		      (datum->syntax-object 
-		       stx
-		       (dm-subst
-			ht
-			(apply p (cdr (dm-syntax->datum stx ht))))
-		       stx))))))))])))
-
-  (define-syntax defmacro
-    (syntax-rules ()
-	[(_ name formals body1 body ...)
-	 (define-macro (name . formals) body1 body ...)])))
+(require racket/defmacro)
+(provide (all-from-out racket/defmacro))