diff --git a/hosts/bagel-box/default.nix b/hosts/bagel-box/default.nix
index 8d5510c..965ff8b 100644
--- a/hosts/bagel-box/default.nix
+++ b/hosts/bagel-box/default.nix
@@ -39,8 +39,8 @@
 
     hydra.enable = true;
     hydra.dbi = "dbi:Pg:dbname=hydra;user=hydra";
-    # Takes 10 builders (0 → 9).
-    hydra.builders = lib.genList (i: "builder-${builtins.toString i}") 9;
+    # Takes 4 builders (0 → 3).
+    hydra.builders = lib.genList (i: "builder-${builtins.toString i}") 4;
 
     ofborg.enable = true;
   };