diff --git a/private/file-walker.rkt b/private/file-walker.rkt
index 93c7e3e..2c6a566 100644
--- a/private/file-walker.rkt
+++ b/private/file-walker.rkt
@@ -46,7 +46,8 @@
               (unless (string=? bn nbn)
                 (with-handlers ([exn? (λ (e)
                                          (warn-am "Cannot rename dirty filename: ~a" nbn))])
-                  (displayln (format "bn = ~a, nbn = ~a" bn nbn))
+                  (display "bn = ") (write bn) (display ", nbn = ") (write nbn)
+                  (newline)
                   ;(rename-file-or-directory (build-path bd bn)
                   ;                          (build-path bn nbn) #f)
                   ;(set! path (build-path bd nbn))