diff --git a/guix-data-service/web/render.scm b/guix-data-service/web/render.scm
index 02ec42d..ca51a35 100644
--- a/guix-data-service/web/render.scm
+++ b/guix-data-service/web/render.scm
@@ -245,7 +245,7 @@
 
 (define (no-content)
   (list (build-response #:code 204)
-        ""))
+        #f))
 
 (define (redirect path)
   (let ((uri (build-uri 'http