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-rw-r--r--gnu/system/vm.scm2
1 files changed, 1 insertions, 1 deletions
diff --git a/gnu/system/vm.scm b/gnu/system/vm.scm
index f3bccec989..3390f5a88f 100644
--- a/gnu/system/vm.scm
+++ b/gnu/system/vm.scm
@@ -713,7 +713,7 @@ with '-virtfs' options for the host file systems listed in SHARED-FS."
 
      #$@(map virtfs-option shared-fs)
      "-vga std"
-     (format #f "-drive file=~a,if=virtio,cache=writeback,werror=report,readonly"
+     (format #f "-drive file=~a,if=virtio,cache=writeback,werror=report,readonly=on"
              #$image)))
 
 (define* (system-qemu-image/shared-store-script os