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-rw-r--r--gnu/build/file-systems.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index f9cc4088bb..16160a659b 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -319,7 +319,7 @@ SBLOCK as a bytevector. If that's not set, returns the creation time."
(second (sub-bytevector uuid 12 2))
(hundredths (sub-bytevector uuid 14 2))
(parts (list year month day hour minute second hundredths)))
- (string-append (string-join (map digits->string parts)))))
+ (string-append (string-join (map digits->string parts) "-"))))
(define (iso9660-superblock-volume-name sblock)
"Return the volume name of SBLOCK as a string. The volume name is an ASCII