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-rw-r--r--src/libstore/build.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index 232059e70db0..aa539a1fa42b 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -617,7 +617,6 @@ HookInstance::HookInstance()
     });
 
     pid.setSeparatePG(true);
-    pid.setKillSignal(SIGTERM);
     fromHook.writeSide.close();
     toHook.readSide.close();
 }
@@ -626,6 +625,7 @@ HookInstance::HookInstance()
 HookInstance::~HookInstance()
 {
     try {
+        toHook.writeSide.close();
         pid.kill(true);
     } catch (...) {
         ignoreException();