diff --git a/nixos/modules/services/networking/zerotierone.nix b/nixos/modules/services/networking/zerotierone.nix
index 68c04118fdd5..2485327ed44e 100644
--- a/nixos/modules/services/networking/zerotierone.nix
+++ b/nixos/modules/services/networking/zerotierone.nix
@@ -34,7 +34,7 @@ in
   options.services.zerotierone.package = mkPackageOption pkgs "zerotierone" { };
 
   options.services.zerotierone.localConf = mkOption {
-    default = null;
+    default = {};
     description = ''
       Optional configuration to be written to the Zerotier JSON-based local.conf.
       If set, the configuration will be symlinked to `/var/lib/zerotier-one/local.conf` at build time.