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-rw-r--r--src/libstore/build.cc2
-rw-r--r--src/libstore/globals.cc2
2 files changed, 2 insertions, 2 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index d59470603295..4376a8322c42 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1505,7 +1505,7 @@ void DerivationGoal::buildDone()
 
 HookReply DerivationGoal::tryBuildHook()
 {
-    if (!settings.useBuildHook) return rpDecline;
+    if (!settings.useBuildHook || getEnv("NIX_BUILD_HOOK") == "") return rpDecline;
 
     if (!worker.hook)
         worker.hook = std::shared_ptr<HookInstance>(new HookInstance);
diff --git a/src/libstore/globals.cc b/src/libstore/globals.cc
index 2bfebb77a130..28982ec15078 100644
--- a/src/libstore/globals.cc
+++ b/src/libstore/globals.cc
@@ -39,7 +39,7 @@ Settings::Settings()
     thisSystem = SYSTEM;
     maxSilentTime = 0;
     buildTimeout = 0;
-    useBuildHook = getEnv("NIX_BUILD_HOOK") != "";
+    useBuildHook = true;
     printBuildTrace = false;
     reservedSize = 1024 * 1024;
     fsyncMetadata = true;