diff --git a/collects/help/help-utils.rkt b/collects/help/help-utils.rkt
index 56f7ad5ee6..0694a91ec7 100644
--- a/collects/help/help-utils.rkt
+++ b/collects/help/help-utils.rkt
@@ -1,4 +1,4 @@
-#lang scheme/base
+#lang racket/base
 
 ;; This file provides the utilities that racket's `help' form uses.
 ;; It is required dynamically when used from racket, to avoid the
@@ -10,14 +10,14 @@
          scribble/manual-struct
          net/uri-codec
          net/sendurl
-         scheme/path
-         scheme/list
-         "search.ss")
+         racket/string
+         racket/path
+         "search.rkt")
 
 (provide search-for find-help find-help/lib go-to-main-page)
 
 (define (search-for strs)
-  (perform-search (apply string-append (add-between strs " "))))
+  (perform-search (string-join strs " ")))
 
 (define-namespace-anchor anchor)