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-rw-r--r--gnu/system/vm.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index 861f2a427a..80a8618729 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -699,7 +699,8 @@ of the GNU system as described by OS."
(device (file-system->mount-tag source))
(type "9p")
(flags (if writable? '() '(read-only)))
- (options "trans=virtio,cache=loose")
+ (options (string-append "trans=virtio"
+ (if writable? "" ",cache=loose")))
(check? #f)
(create-mount-point? #t)))))