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-rw-r--r--nix/libstore/build.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/nix/libstore/build.cc b/nix/libstore/build.cc
index ad53b81413..74cd05417f 100644
--- a/nix/libstore/build.cc
+++ b/nix/libstore/build.cc
@@ -1648,7 +1648,7 @@ HookReply DerivationGoal::tryBuildHook()
     set<int> fds;
     fds.insert(hook->fromHook.readSide);
     fds.insert(hook->builderOut.readSide);
-    worker.childStarted(shared_from_this(), hook->pid, fds, false, false);
+    worker.childStarted(shared_from_this(), hook->pid, fds, false, true);
 
     if (settings.printBuildTrace)
         printMsg(lvlError, format("@ build-started %1% - %2% %3% %4%")