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-rw-r--r--third_party/nix/src/libmain/common-args.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libmain/common-args.cc b/third_party/nix/src/libmain/common-args.cc
index 9d6f6445c0e7..3d9b8ebfaefd 100644
--- a/third_party/nix/src/libmain/common-args.cc
+++ b/third_party/nix/src/libmain/common-args.cc
@@ -26,7 +26,7 @@ MixCommonArgs::MixCommonArgs(const string& programName)
       .shortName('j')
       .label("jobs")
       .description("maximum number of parallel builds")
-      .handler([=](std::string s) { settings.set("max-jobs", s); });
+      .handler([=](const std::string& s) { settings.set("max-jobs", s); });
 
   std::string cat = "config";
   globalConfig.convertToArgs(*this, cat);