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-rw-r--r--nixos/lib/build-vms.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/nixos/lib/build-vms.nix b/nixos/lib/build-vms.nix
index 064e44f643b..f0a58628c68 100644
--- a/nixos/lib/build-vms.nix
+++ b/nixos/lib/build-vms.nix
@@ -41,7 +41,7 @@ rec {
             # The human version (e.g. 21.05-pre) is left as is, because it is useful
             # for external modules that test with e.g. nixosTest and rely on that
             # version number.
-            config.system.nixos.revision = "constant-nixos-revision";
+            config.system.nixos.revision = mkForce "constant-nixos-revision";
           }
           { key = "nodes"; _module.args.nodes = nodes; }
         ] ++ optional minimal ../modules/testing/minimal-kernel.nix;