diff --git a/src/libstore/build/derivation-building-goal.cc b/src/libstore/build/derivation-building-goal.cc
index 50315dede..e0412c3dd 100644
--- a/src/libstore/build/derivation-building-goal.cc
+++ b/src/libstore/build/derivation-building-goal.cc
@@ -27,16 +27,15 @@
 namespace nix {
 
 DerivationBuildingGoal::DerivationBuildingGoal(
-    const StorePath & drvPath, const Derivation & drv_, Worker & worker, BuildMode buildMode)
+    const StorePath & drvPath, const Derivation & drv, Worker & worker, BuildMode buildMode)
     : Goal(worker, gaveUpOnSubstitution())
     , drvPath(drvPath)
+    , drv{std::make_unique<Derivation>(drv)}
     , buildMode(buildMode)
 {
-    drv = std::make_unique<Derivation>(drv_);
-
     try {
         drvOptions =
-            std::make_unique<DerivationOptions>(DerivationOptions::fromStructuredAttrs(drv->env, drv->structuredAttrs));
+            std::make_unique<DerivationOptions>(DerivationOptions::fromStructuredAttrs(drv.env, drv.structuredAttrs));
     } catch (Error & e) {
         e.addTrace({}, "while parsing derivation '%s'", worker.store.printStorePath(drvPath));
         throw;
diff --git a/src/libstore/build/derivation-goal.cc b/src/libstore/build/derivation-goal.cc
index e50ce8f79..1939ddbfe 100644
--- a/src/libstore/build/derivation-goal.cc
+++ b/src/libstore/build/derivation-goal.cc
@@ -33,6 +33,7 @@ DerivationGoal::DerivationGoal(
     : Goal(worker, haveDerivation())
     , drvPath(drvPath)
     , wantedOutput(wantedOutput)
+    , drv{std::make_unique<Derivation>(drv)}
     , outputHash{[&] {
         auto outputHashes = staticOutputHashes(worker.evalStore, drv);
         if (auto * mOutputHash = get(outputHashes, wantedOutput))
@@ -41,7 +42,6 @@ DerivationGoal::DerivationGoal(
     }()}
     , buildMode(buildMode)
 {
-    this->drv = std::make_unique<Derivation>(drv);
 
     name = fmt("getting output '%s' from derivation '%s'", wantedOutput, worker.store.printStorePath(drvPath));
     trace("created");