diff --git a/hosts/hydra/hydra.nix b/hosts/hydra/hydra.nix
index e6b1a4cc..5008f0b0 100644
--- a/hosts/hydra/hydra.nix
+++ b/hosts/hydra/hydra.nix
@@ -47,6 +47,8 @@ in {
     useSubstitutes = true;
     extraConfig = ''
       max_output_size = 4294967296
+      evaluator_workers = 1
+      evaluator_max_memory_size = 65536
     '';
   };
   systemd.services.hydra-evaluator.serviceConfig = {