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-rw-r--r--gnu/image.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/image.scm b/gnu/image.scm
index 68784deb12..b2ef0f60af 100644
--- a/gnu/image.scm
+++ b/gnu/image.scm
@@ -152,7 +152,7 @@ that is not in SET, mentioning FIELD in the error message."
 
 ;; The supported image formats.
 (define-set-sanitizer validate-image-format format
-  (disk-image compressed-qcow2 docker iso9660))
+  (disk-image compressed-qcow2 docker iso9660 tarball))
 
 ;; The supported partition table types.
 (define-set-sanitizer validate-partition-table-type partition-table-type