diff --git a/hosts/bagel-box/default.nix b/hosts/bagel-box/default.nix
index df74126..07f4057 100644
--- a/hosts/bagel-box/default.nix
+++ b/hosts/bagel-box/default.nix
@@ -40,8 +40,8 @@
 
     hydra.enable = true;
     hydra.dbi = "dbi:Pg:dbname=hydra;user=hydra";
-    # Takes 4 builders (0 → 3).
-    hydra.builders = lib.genList (i: "builder-${builtins.toString i}") 4;
+    # Takes 10 builders (0 → 9).
+    hydra.builders = lib.genList (i: "builder-${builtins.toString i}") 10;
 
     ofborg.enable = true;
   };