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-rw-r--r--guix/gnu-maintenance.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/guix/gnu-maintenance.scm b/guix/gnu-maintenance.scm
index ee6e0db747..41e0f4443d 100644
--- a/guix/gnu-maintenance.scm
+++ b/guix/gnu-maintenance.scm
@@ -980,7 +980,8 @@ the directory containing its source tarball. Optionally include a VERSION
string to fetch a specific version."
(let* ((uri (string->uri
(match (origin-uri (package-source package))
- ((? (cut string-prefix? "mirror://" <>) url)
+ ((and (? string?)
+ (? (cut string-prefix? "mirror://" <>) url))
;; Retrieve the authoritative HTTP URL from a mirror.
(http-url? url))
((? string? url) url)