diff --git a/nixos/tests/etcd-cluster.nix b/nixos/tests/etcd-cluster.nix
index 410cb654794f..2812b56239f3 100644
--- a/nixos/tests/etcd-cluster.nix
+++ b/nixos/tests/etcd-cluster.nix
@@ -79,7 +79,7 @@ import ./make-test-python.nix ({ pkgs, ... } : let
         keyFile = etcd_key;
         certFile = etcd_cert;
         trustedCaFile = ca_pem;
-        peerClientCertAuth = true;
+        clientCertAuth = true;
         listenClientUrls = ["https://127.0.0.1:2379"];
         listenPeerUrls = ["https://0.0.0.0:2380"];
       };