diff --git a/config/services/hydra/default.nix b/config/services/hydra/default.nix
index 5f85023..6279c58 100644
--- a/config/services/hydra/default.nix
+++ b/config/services/hydra/default.nix
@@ -35,6 +35,7 @@
       binary_cache_public_uri = https://cache.kyouma.net
       evaluator_workers = 8
       evaluator_max_memory_size = 16384
+      max_output_size = 4294967296
     '';
   };
   services.harmonia = {