1 files changed, 1 insertions, 1 deletions
diff --git a/src/nix/copy.cc b/src/nix/copy.cc
index d9e6c949352b..fe963e794277 100644
--- a/src/nix/copy.cc
+++ b/src/nix/copy.cc
@@ -22,7 +22,7 @@ struct CmdCopy : StorePathsCommand
         mkFlag()
             .longName("no-check-sigs")
             .description("do not require that paths are signed by trusted keys")
-            .handler([&](Strings ss) { checkSigs = NoCheckSigs; });
+            .set(&checkSigs, NoCheckSigs);
     }
 
     std::string name() override