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-rw-r--r--gnu/build/file-systems.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/gnu/build/file-systems.scm b/gnu/build/file-systems.scm
index f9cc4088bb..b6930497d6 100644
--- a/gnu/build/file-systems.scm
+++ b/gnu/build/file-systems.scm
@@ -48,6 +48,7 @@
             string->ext3-uuid
             string->ext4-uuid
             string->btrfs-uuid
+            iso9660-uuid->string
 
             bind-mount
 
@@ -319,7 +320,7 @@ 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