diff --git a/lix/libstore/build/derivation-goal.cc b/lix/libstore/build/derivation-goal.cc
index cfd0b34eb..1b6c38f9b 100644
--- a/lix/libstore/build/derivation-goal.cc
+++ b/lix/libstore/build/derivation-goal.cc
@@ -1309,6 +1309,8 @@ try {
 kj::Promise<Result<std::optional<Goal::WorkResult>>>
 DerivationGoal::handleHookOutput(AsyncInputStream & in) noexcept
 try {
+    std::string currentHookLine;
+
     auto buf = kj::heapArray<char>(4096);
     while (true) {
         const auto got = TRY_AWAIT(in.read(buf.begin(), buf.size()));
diff --git a/lix/libstore/build/derivation-goal.hh b/lix/libstore/build/derivation-goal.hh
index 8bd7b2975..0627e0d40 100644
--- a/lix/libstore/build/derivation-goal.hh
+++ b/lix/libstore/build/derivation-goal.hh
@@ -201,8 +201,6 @@ struct DerivationGoal : public Goal
      */
     std::list<std::string> logTail;
 
-    std::string currentHookLine;
-
     /**
      * The build hook.
      */