diff --git a/private/file-walker.rkt b/private/file-walker.rkt
index 9f33272..2210883 100644
--- a/private/file-walker.rkt
+++ b/private/file-walker.rkt
@@ -259,5 +259,7 @@
                   ((string=? stem3 "") "_")
                   (reserved? (string-append "_" stem3))
                   (else stem3))))
-    (string-append stem4 ext)))
+    (string-trim
+      (string-append 
+         (string-trim stem4) (string-trim ext)))))