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-rw-r--r--guix/upstream.scm5
1 files changed, 3 insertions, 2 deletions
diff --git a/guix/upstream.scm b/guix/upstream.scm
index 12eed3f2b4..c62667dd01 100644
--- a/guix/upstream.scm
+++ b/guix/upstream.scm
@@ -98,8 +98,9 @@ correspond to the same version."
(urls (append (upstream-source-urls release)
(upstream-source-urls head)))
(signature-urls
- (append (upstream-source-signature-urls release)
- (upstream-source-signature-urls head))))
+ (let ((one (upstream-source-signature-urls release))
+ (two (upstream-source-signature-urls release)))
+ (and one two (append one two)))))
tail)
(cons release result)))
(()