diff --git a/nixos/modules/services/networking/kea.nix b/nixos/modules/services/networking/kea.nix
index d674a97391c9..f194edcc9883 100644
--- a/nixos/modules/services/networking/kea.nix
+++ b/nixos/modules/services/networking/kea.nix
@@ -298,7 +298,7 @@ in
       ];
 
       serviceConfig = {
-        ExecStart = "${package}/bin/kea-ctrl-agent -c /etc/kea/ctrl-agent.conf ${lib.escapeShellArgs cfg.dhcp4.extraArgs}";
+        ExecStart = "${package}/bin/kea-ctrl-agent -c /etc/kea/ctrl-agent.conf ${lib.escapeShellArgs cfg.ctrl-agent.extraArgs}";
         KillMode = "process";
         Restart = "on-failure";
       } // commonServiceConfig;