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-rw-r--r--gnu/services.scm5
1 files changed, 3 insertions, 2 deletions
diff --git a/gnu/services.scm b/gnu/services.scm
index e7a3a95e43..7941cd3af0 100644
--- a/gnu/services.scm
+++ b/gnu/services.scm
@@ -1,5 +1,5 @@
 ;;; GNU Guix --- Functional package management for GNU
-;;; Copyright © 2015, 2016, 2017, 2018, 2019 Ludovic Courtès <ludo@gnu.org>
+;;; Copyright © 2015, 2016, 2017, 2018, 2019, 2020 Ludovic Courtès <ludo@gnu.org>
 ;;; Copyright © 2016 Chris Marusich <cmmarusich@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
@@ -322,7 +322,8 @@ This is a shorthand for (map (lambda (svc) ...) %base-services)."
   "Return as a monadic value the derivation of the 'system' directory
 containing the given entries."
   (mlet %store-monad ((entries    mentries)
-                      (extensions (sequence %store-monad mextensions)))
+                      (extensions (mapm/accumulate-builds identity
+                                                          mextensions)))
     (lower-object
      (file-union "system"
                  (append entries (concatenate extensions))))))