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-rw-r--r--nixos/lib/testing.nix1
1 files changed, 1 insertions, 0 deletions
diff --git a/nixos/lib/testing.nix b/nixos/lib/testing.nix
index 58c447c76db6..9339ba78ff0c 100644
--- a/nixos/lib/testing.nix
+++ b/nixos/lib/testing.nix
@@ -149,6 +149,7 @@ rec {
           { key = "run-in-machine";
             networking.hostName = "client";
             nix.readOnlyStore = false;
+            virtualisation.writableStore = false;
           }
         ];