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-rw-r--r--third_party/nix/src/libexpr/get-drvs.hh2
1 files changed, 1 insertions, 1 deletions
diff --git a/third_party/nix/src/libexpr/get-drvs.hh b/third_party/nix/src/libexpr/get-drvs.hh
index ef6ecd253e6a..f0de0f67b8da 100644
--- a/third_party/nix/src/libexpr/get-drvs.hh
+++ b/third_party/nix/src/libexpr/get-drvs.hh
@@ -34,7 +34,7 @@ struct DrvInfo {
 
   DrvInfo(EvalState& state) : state(&state){};
   DrvInfo(EvalState& state, string attrPath, Bindings* attrs);
-  DrvInfo(EvalState& state, ref<Store> store,
+  DrvInfo(EvalState& state, const ref<Store>& store,
           const std::string& drvPathWithOutputs);
 
   string queryName() const;