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-rw-r--r--third_party/nix/src/libstore/misc.cc5
1 files changed, 3 insertions, 2 deletions
diff --git a/third_party/nix/src/libstore/misc.cc b/third_party/nix/src/libstore/misc.cc
index 076c691b004c..f95c4bec8b0c 100644
--- a/third_party/nix/src/libstore/misc.cc
+++ b/third_party/nix/src/libstore/misc.cc
@@ -171,8 +171,9 @@ void Store::queryMissing(const PathSet& targets, PathSet& willBuild_,
     }
   };
 
-  auto checkOutput = [&](const Path& drvPath, ref<Derivation> drv,
-                         const Path& outPath, ref<Sync<DrvState>> drvState_) {
+  auto checkOutput = [&](const Path& drvPath, const ref<Derivation>& drv,
+                         const Path& outPath,
+                         const ref<Sync<DrvState>>& drvState_) {
     if (drvState_->lock()->done) {
       return;
     }