diff --git a/build/hydra.nix b/build/hydra.nix
index 314894f7..69d8996c 100644
--- a/build/hydra.nix
+++ b/build/hydra.nix
@@ -105,7 +105,7 @@ in
 
     allow_import_from_derivation = false
 
-    max_output_size = 3621225472 # 3 << 30 + 400000000 = 3 GiB + 0.4 GB
+    max_output_size = 3821225472 # 3 << 30 + 600000000 = 3 GiB + 0.6 GB
     max_db_connections = 350
 
     queue_runner_metrics_address = [::]:9198