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-rw-r--r--third_party/nix/src/libutil/args.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libutil/args.cc b/third_party/nix/src/libutil/args.cc
index 2b4407480254..48fa715fdf0f 100644
--- a/third_party/nix/src/libutil/args.cc
+++ b/third_party/nix/src/libutil/args.cc
@@ -175,7 +175,7 @@ Args::FlagMaker& Args::FlagMaker::mkHashTypeFlag(HashType* ht) {
   arity(1);
   label("type");
   description("hash algorithm ('md5', 'sha1', 'sha256', or 'sha512')");
-  handler([ht](std::string s) {
+  handler([ht](const std::string& s) {
     *ht = parseHashType(s);
     if (*ht == htUnknown) {
       throw UsageError("unknown hash type '%1%'", s);