diff --git a/src/script/hydra_build.pl.in b/src/script/hydra_build.pl.in
index 77448c1b..be2562b4 100755
--- a/src/script/hydra_build.pl.in
+++ b/src/script/hydra_build.pl.in
@@ -229,7 +229,7 @@ sub doBuild {
         # Run Nix to perform the build, and monitor the stderr output
         # to get notifications about specific build steps, the
         # associated log files, etc.
-        my $cmd = "nix-store -j1 --no-build-hook --realise $drvPath " .
+        my $cmd = "nix-store --realise $drvPath " .
             "--max-silent-time $maxsilent --keep-going --fallback " .
             "--no-build-output --log-type flat --print-build-trace " .
             "--add-root " . gcRootFor $outPath . " 2>&1";