diff --git a/modules/services/server/hydra.nix b/modules/services/server/hydra.nix
index b418cfe..39276ed 100644
--- a/modules/services/server/hydra.nix
+++ b/modules/services/server/hydra.nix
@@ -53,6 +53,7 @@
     nix = {
       settings = {
         cores = 4;
+	max-jobs = 4;
         trusted-users = [
           "hydra"
         ];