diff --git a/nix/modules/spindle.nix b/nix/modules/spindle.nix
index d665752c..9de40bab 100644
--- a/nix/modules/spindle.nix
+++ b/nix/modules/spindle.nix
@@ -335,6 +335,7 @@ in
             LogsDirectory = "spindle";
             StateDirectory = "spindle";
             Delegate = cfg.pipelines.microvm.cgroup.enable;
+            DelegateSubgroup = lib.optionalString cfg.pipelines.microvm.cgroup.enable "supervisor";
             EnvironmentFile = mkIf (cfg.environmentFile != null) cfg.environmentFile;
 
             Environment = [