diff --git a/nixos/modules/services/networking/flannel.nix b/nixos/modules/services/networking/flannel.nix
index ca47a18bc1f6..b93e28e34efd 100644
--- a/nixos/modules/services/networking/flannel.nix
+++ b/nixos/modules/services/networking/flannel.nix
@@ -149,6 +149,6 @@ in {
       serviceConfig.ExecStart = "${cfg.package}/bin/flannel";
     };
 
-    services.etcd.enable = mkDefault cfg.etcd.endpoints == ["http://127.0.0.1:2379"];
+    services.etcd.enable = mkDefault (cfg.etcd.endpoints == ["http://127.0.0.1:2379"]);
   };
 }