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-rw-r--r--third_party/nix/src/libexpr/eval.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/eval.cc b/third_party/nix/src/libexpr/eval.cc
index 4be301167be9..4053dffe5185 100644
--- a/third_party/nix/src/libexpr/eval.cc
+++ b/third_party/nix/src/libexpr/eval.cc
@@ -298,7 +298,7 @@ static Strings parseNixPath(const string& s) {
   return res;
 }
 
-EvalState::EvalState(const Strings& _searchPath, ref<Store> store)
+EvalState::EvalState(const Strings& _searchPath, const ref<Store>& store)
     : sWith(symbols.create("<with>")),
       sOutPath(symbols.create("outPath")),
       sDrvPath(symbols.create("drvPath")),