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-rw-r--r--third_party/nix/src/libstore/globals.cc7
1 files changed, 4 insertions, 3 deletions
diff --git a/third_party/nix/src/libstore/globals.cc b/third_party/nix/src/libstore/globals.cc
index 57ba8cff64..066de44365 100644
--- a/third_party/nix/src/libstore/globals.cc
+++ b/third_party/nix/src/libstore/globals.cc
@@ -149,17 +149,18 @@ void BaseSetting<SandboxMode>::convertToArg(Args& args,
   args.mkFlag()
       .longName(name)
       .description("Enable sandboxing.")
-      .handler([=](std::vector<std::string> ss) { override(smEnabled); })
+      .handler([=](const std::vector<std::string>& ss) { override(smEnabled); })
       .category(category);
   args.mkFlag()
       .longName("no-" + name)
       .description("Disable sandboxing.")
-      .handler([=](std::vector<std::string> ss) { override(smDisabled); })
+      .handler(
+          [=](const std::vector<std::string>& ss) { override(smDisabled); })
       .category(category);
   args.mkFlag()
       .longName("relaxed-" + name)
       .description("Enable sandboxing, but allow builds to disable it.")
-      .handler([=](std::vector<std::string> ss) { override(smRelaxed); })
+      .handler([=](const std::vector<std::string>& ss) { override(smRelaxed); })
       .category(category);
 }