diff --git a/src/script/hydra-build b/src/script/hydra-build
index 54232458..39f75aba 100755
--- a/src/script/hydra-build
+++ b/src/script/hydra-build
@@ -120,7 +120,9 @@ sub doBuild {
         # associated log files, etc.
         my $cmd = "nix-store --realise $drvPath " .
             "--timeout $timeout " .
-            "--max-silent-time $maxsilent --keep-going --fallback " .
+            "--max-silent-time $maxsilent " .
+            "--option build-max-log-size 67108864 " .
+            "--keep-going --fallback " .
             "--no-build-output --log-type flat --print-build-trace " .
             "--add-root " . gcRootFor($outputs{out} // $outputs{(sort keys %outputs)[0]}) . " 2>&1";