diff --git a/modules/cluster/deployment-options.nix b/modules/cluster/deployment-options.nix
index 4a4afcfb..0b0e0907 100644
--- a/modules/cluster/deployment-options.nix
+++ b/modules/cluster/deployment-options.nix
@@ -40,4 +40,13 @@
       '';
     };
   };
+
+  config = {
+    # HACK: Avoid conflicts when building a NixOS configuration on Hydra
+    boot.loader.grub.enable = false;
+    fileSystems."/" = {
+      device = "rootfs";
+      fsType = "tmpfs";
+    };
+  };
 }