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-rw-r--r--third_party/nix/src/nix/copy.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/nix/copy.cc b/third_party/nix/src/nix/copy.cc
index a527d40cfa..ec25d0fc5a 100644
--- a/third_party/nix/src/nix/copy.cc
+++ b/third_party/nix/src/nix/copy.cc
@@ -8,7 +8,7 @@
 
 using namespace nix;
 
-struct CmdCopy : StorePathsCommand {
+struct CmdCopy final : StorePathsCommand {
   std::string srcUri, dstUri;
 
   CheckSigsFlag checkSigs = CheckSigs;