diff --git a/guix/scripts/substitute-binary.scm b/guix/scripts/substitute-binary.scm
index 13c3828..786193a 100755
--- a/guix/scripts/substitute-binary.scm
+++ b/guix/scripts/substitute-binary.scm
@@ -238,7 +238,7 @@ reading PORT."
   (define (download url)
     ;; Download the .narinfo from URL, and return its contents as a list of
     ;; key/value pairs.
-    (false-if-exception (fetch (string->uri url))))
+    (fetch (string->uri url)))
 
   (and (string=? (cache-store-directory cache) (%store-prefix))
        (and=> (download (string-append (cache-url cache) "/"