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-rw-r--r--third_party/nix/src/nix/upgrade-nix.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix/upgrade-nix.cc b/third_party/nix/src/nix/upgrade-nix.cc
index 1d85af03c1..3e3b55789d 100644
--- a/third_party/nix/src/nix/upgrade-nix.cc
+++ b/third_party/nix/src/nix/upgrade-nix.cc
@@ -13,7 +13,7 @@
 
 using namespace nix;
 
-struct CmdUpgradeNix : MixDryRun, StoreCommand {
+struct CmdUpgradeNix final : MixDryRun, StoreCommand {
   Path profileDir;
   std::string storePathsUrl =
       "https://github.com/NixOS/nixpkgs/raw/master/nixos/modules/installer/"