diff --git a/utils.rkt b/utils.rkt
index c47fadc..0602978 100644
--- a/utils.rkt
+++ b/utils.rkt
@@ -1,6 +1,6 @@
 #lang typed/racket
 
-(require typed/graph typed-compose typed/racket/stream
+(require typed/graph typed-compose typed/racket/stream syntax/parse/define
          (for-syntax syntax/parse racket/list))
 
 (provide
@@ -45,12 +45,11 @@
     (check-equal? (eval1-with ht expr)
                   4)))
 
-(define-syntax (auto-hash-ref/explicit stx)
-  (syntax-parse stx
-    [(_ (ht:id keys:id ...) body:expr)
-     #`(let #,(for/list ([key (syntax->list #'(keys ...))])
-                `[,key (hash-ref ,#'ht ',key)])
-           body)]))
+(define-syntax-parser auto-hash-ref/explicit
+  [(_ (ht:id keys:id ...) body:expr)
+   #`(let #,(for/list ([key (syntax->list #'(keys ...))])
+              `[,key (hash-ref ,#'ht ',key)])
+         body)])
 
 (module+ test
   (test-case "auto-hash-ref/explicit"