diff --git a/nixos/modules/services/networking/oidentd.nix b/nixos/modules/services/networking/oidentd.nix
index 923e7cd0986e..738ab8313a5d 100644
--- a/nixos/modules/services/networking/oidentd.nix
+++ b/nixos/modules/services/networking/oidentd.nix
@@ -28,7 +28,9 @@ with lib;
     jobs.oidentd =
       { startOn = "started network-interfaces";
         daemonType = "fork";
-        exec = "${pkgs.oidentd}/sbin/oidentd -u oidentd -g nogroup";
+        exec = "${pkgs.oidentd}/sbin/oidentd -u oidentd -g nogroup" +
+          optionalString config.networking.enableIPv6 " -a ::"
+        ;
       };
 
     users.extraUsers.oidentd = {