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-rw-r--r--third_party/nix/src/libexpr/eval.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/eval.hh b/third_party/nix/src/libexpr/eval.hh
index 48c67b6229..48400d5f08 100644
--- a/third_party/nix/src/libexpr/eval.hh
+++ b/third_party/nix/src/libexpr/eval.hh
@@ -105,7 +105,7 @@ class EvalState {
   std::unordered_map<Path, Path> resolvedPaths;
 
  public:
-  EvalState(const Strings& _searchPath, ref<Store> store);
+  EvalState(const Strings& _searchPath, const ref<Store>& store);
   ~EvalState();
 
   void addToSearchPath(const string& s);