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-rw-r--r--nixos/modules/misc/version.nix4
1 files changed, 2 insertions, 2 deletions
diff --git a/nixos/modules/misc/version.nix b/nixos/modules/misc/version.nix
index 8dbbbe6761c4..c394ff592f49 100644
--- a/nixos/modules/misc/version.nix
+++ b/nixos/modules/misc/version.nix
@@ -42,8 +42,8 @@ in
 
     nixos.revision = mkOption {
       internal = true;
-      type = types.str;
-      default = trivial.revisionWithDefault "master";
+      type = types.nullOr types.str;
+      default = trivial.revisionWithDefault null;
       description = "The Git revision from which this NixOS configuration was built.";
     };