diff --git a/pkgs/racket-test/tests/zo-path.rkt b/pkgs/racket-test/tests/zo-path.rkt
index 8e3cdf56eb..e211ea2600 100644
--- a/pkgs/racket-test/tests/zo-path.rkt
+++ b/pkgs/racket-test/tests/zo-path.rkt
@@ -1,6 +1,8 @@
 #lang racket
 (require setup/dirs)
 
+(provide check-one)
+
 ;; Paths from the build location shouldn't show up in bytecode files
 ;; or documentation. Check ".zo", ".dep", and ".html" files in the
 ;; build on the assumption that the first three elements of the
@@ -11,26 +13,26 @@
    (regexp-quote
     (path->bytes
      (apply build-path
-            (take (explode-path (find-collects-dir)) 
+            (take (explode-path (find-collects-dir))
                   3))))))
 
-(define (check-content rx:name)
-  (lambda (name kind v)
-    (when (regexp-match? rx:name name)
-      (call-with-input-file* name
-        (lambda (in)
-          (when (regexp-match? rx:dir in)
-            (eprintf "Found ~s in ~s\n" rx:dir name)))))))
+(define (check-one file)
+  (call-with-input-file*
+   file
+   (lambda (in)
+     (when (regexp-match? rx:dir in)
+       (eprintf "Found ~s in ~s\n" rx:dir file)))))
 
-(fold-files (check-content #rx"[.](?:zo|dep)$")
-            (void)
-            (find-collects-dir))
+(define ((check-content rx:name) name kind v)
+  (when (regexp-match? rx:name name)
+    (check-one name)))
 
-(fold-files (check-content #rx"[.](?:zo|dep)$")
-            (void)
-            (find-pkgs-dir))
+(module+ main
+  (fold-files (check-content #rx"[.](?:zo|dep)$")
+              (void)
+              (find-pkgs-dir))
 
-;; Check rendered docs, too:
-(fold-files (check-content #rx"[.](?:html)$")
-            (void)
-            (find-doc-dir))
+  ;; Check rendered docs, too:
+  (fold-files (check-content #rx"[.](?:html)$")
+              (void)
+              (find-doc-dir)))