diff --git a/flake.nix b/flake.nix
index 9a7a19e..ab30060 100644
--- a/flake.nix
+++ b/flake.nix
@@ -173,7 +173,7 @@
         }
       ];
 
-      builders = lib.listToAttrs (lib.genList makeBuilder 11);
+      builders = lib.listToAttrs (map makeBuilder [4 5 10 11]);
     in {
       meta.nixpkgs = systemBits.x86_64-linux.pkgs;
       # Add any non-x86_64 native systems here.
diff --git a/hosts/build-coord/default.nix b/hosts/build-coord/default.nix
index 8da91d1..26c0cdb 100644
--- a/hosts/build-coord/default.nix
+++ b/hosts/build-coord/default.nix
@@ -9,8 +9,7 @@
 
   bagel.services = {
     hydra.enable = true;
-    # Takes 10 builders (0 → 9).
-    hydra.builders = lib.genList (i: "builder-${builtins.toString i}") 10;
+    hydra.builders = map (i: "builder-${builtins.toString i}") [4 5 10];
   };
 
   bagel.monitoring.exporters.hydra.enable = true;