From ae93ce8cbc44f3638c1a44c12deddfa0957c8e96 Mon Sep 17 00:00:00 2001
From: Christopher Baines <mail@cbaines.net>
Date: Sat, 24 Oct 2020 17:35:53 +0100
Subject: WIP

---
 guix-build-coordinator/utils.scm | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/guix-build-coordinator/utils.scm b/guix-build-coordinator/utils.scm
index 7b38130..b962b1d 100644
--- a/guix-build-coordinator/utils.scm
+++ b/guix-build-coordinator/utils.scm
@@ -299,10 +299,12 @@ upcoming chunk."
               substitute-urls)))
     (if narinfo
         (append-map
-         (lambda (referenced-output)
-           (peek "REF" referenced-output)
-           (find-missing-substitutes-for-output substitute-urls
-                                                referenced-output))
+         (lambda (reference)
+           (let ((referenced-output
+                  (string-append (%store-prefix) "/" reference)))
+             (peek "REF" referenced-output)
+             (find-missing-substitutes-for-output substitute-urls
+                                                  referenced-output)))
          (narinfo-references narinfo))
         (list output))))
 
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