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-rw-r--r--gnu/services/cuirass.scm6
1 files changed, 3 insertions, 3 deletions
diff --git a/gnu/services/cuirass.scm b/gnu/services/cuirass.scm
index 4d4f81a3a8..34564b3894 100644
--- a/gnu/services/cuirass.scm
+++ b/gnu/services/cuirass.scm
@@ -375,9 +375,9 @@ CONFIG."
                                          (number->string publish-port)))
                                   '())
                            #$@(if substitute-urls
-                                  (string-append
-                                   "--substitute-urls="
-                                   (string-join substitute-urls))
+                                  (list (string-append
+                                         "--substitute-urls="
+                                         (string-join substitute-urls)))
                                   '())
                            #$@(if public-key
                                   (list