diff --git a/src/libstore/build/entry-points.cc b/src/libstore/build/entry-points.cc
index edfad3cbb..808179a4d 100644
--- a/src/libstore/build/entry-points.cc
+++ b/src/libstore/build/entry-points.cc
@@ -26,11 +26,11 @@ void Store::buildPaths(const std::vector<DerivedPath> & reqs, BuildMode buildMod
     StringSet failed;
     std::shared_ptr<Error> ex;
     for (auto & [i, result] : goals) {
-        if (i->ex) {
+        if (result.ex) {
             if (ex)
-                logError(i->ex->info());
+                logError(result.ex->info());
             else
-                ex = i->ex;
+                ex = result.ex;
         }
         if (result.exitCode != Goal::ecSuccess) {
             if (auto i2 = dynamic_cast<DerivationGoal *>(i.get()))
@@ -119,9 +119,9 @@ void Store::ensurePath(const StorePath & path)
     auto [goal, result] = *goals.begin();
 
     if (result.exitCode != Goal::ecSuccess) {
-        if (goal->ex) {
-            goal->ex->withExitStatus(worker.failingExitStatus());
-            throw std::move(*goal->ex);
+        if (result.ex) {
+            result.ex->withExitStatus(worker.failingExitStatus());
+            throw std::move(*result.ex);
         } else
             throw Error(worker.failingExitStatus(), "path '%s' does not exist and cannot be created", printStorePath(path));
     }
diff --git a/src/libstore/build/goal.cc b/src/libstore/build/goal.cc
index c7dee08b7..3f30c922b 100644
--- a/src/libstore/build/goal.cc
+++ b/src/libstore/build/goal.cc
@@ -25,7 +25,6 @@ try {
     BOOST_OUTCOME_CO_TRY(auto result, co_await workImpl());
 
     trace("done");
-    ex = result.ex;
 
     notify->fulfill(result);
     cleanup();
diff --git a/src/libstore/build/goal.hh b/src/libstore/build/goal.hh
index bceea3c54..b524d3118 100644
--- a/src/libstore/build/goal.hh
+++ b/src/libstore/build/goal.hh
@@ -118,12 +118,6 @@ protected:
     virtual kj::Promise<Result<WorkResult>> workImpl() noexcept = 0;
 
 public:
-
-    /**
-     * Exception containing an error message, if any.
-     */
-    std::shared_ptr<Error> ex;
-
     explicit Goal(Worker & worker, bool isDependency)
         : worker(worker)
         , isDependency(isDependency)