diff --git a/src/page-file.rkt b/src/page-file.rkt
index f77d54f..b9b742b 100644
--- a/src/page-file.rkt
+++ b/src/page-file.rkt
@@ -84,7 +84,7 @@
                             (params->query `(("format" . "json")
                                              ("controller" . "Lightbox")
                                              ("method" . "getMediaDetail")
-                                             ("fileTitle" . prefixed-title)))))
+                                             ("fileTitle" . ,prefixed-title)))))
                   (log-outgoing dest-url)
                   (define dest-res (easy:get dest-url #:timeouts timeouts))
                   (easy:response-json dest-res)]