diff --git a/nixos/modules/services/misc/duckdns.nix b/nixos/modules/services/misc/duckdns.nix
index ff3d411569663..a83a954197a6d 100644
--- a/nixos/modules/services/misc/duckdns.nix
+++ b/nixos/modules/services/misc/duckdns.nix
@@ -1,6 +1,11 @@
-{ config, pkgs, lib, ... }:
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
 let
-cfg = config.services.duckdns;
+  cfg = config.services.duckdns;
 in
 {
   options.services.duckdns = {
@@ -12,7 +17,7 @@ in
       description = ''
         The path to a file containing the token
         used to authenticate with DuckDNS.
-        '';
+      '';
     };
 
     domains = lib.mkOption {
@@ -22,7 +27,7 @@ in
       description = ''
         The record(s) to update in DuckDNS
         (without the .duckdns.org prefix)
-        '';
+      '';
     };
 
     domainsFile = lib.mkOption {
@@ -32,17 +37,17 @@ in
         The path to a file containing a
         newline-separated list of DuckDNS
         domain(s) to be updated
-        '';
+      '';
     };
 
   };
 
   config = lib.mkIf cfg.enable {
     assertions = [
-    {
-      assertion = (cfg.domains != null || cfg.domainsFile != null);
-      message = "services.duckdns.domains or services.duckdns.domainsFile has to be defined";
-    }
+      {
+        assertion = (cfg.domains != null || cfg.domainsFile != null);
+        message = "services.duckdns.domains or services.duckdns.domainsFile has to be defined";
+      }
     ];
     systemd.services.duckdns = {
       description = "DuckDNS Dynamic DNS Client";
@@ -62,15 +67,17 @@ in
         DynamicUser = true;
       };
       script = ''
-        export DUCKDNS_TOKEN=$(systemd-creds cat DUCKDNS_TOKEN_FILE)
-        ${lib.optionalString (cfg.domains != null) ''
-          export DUCKDNS_DOMAINS='${lib.strings.concatStringsSep "," cfg.domains}'
-            ''}
-      ${lib.optionalString (cfg.domainsFile != null) ''
-        export DUCKDNS_DOMAINS=$(systemd-creds cat DUCKDNS_DOMAINS_FILE | sed -z 's/\n/,/g')
-          ''}
-      curl --no-progress-meter -k "https://www.duckdns.org/update?domains=$DUCKDNS_DOMAINS&token=$DUCKDNS_TOKEN&ip=" | grep -v "KO"
-        '';
+          export DUCKDNS_TOKEN=$(systemd-creds cat DUCKDNS_TOKEN_FILE)
+          ${
+            lib.optionalString (cfg.domains != null) ''
+              export DUCKDNS_DOMAINS='${lib.strings.concatStringsSep "," cfg.domains}'
+            ''
+          }
+        ${lib.optionalString (cfg.domainsFile != null) ''
+          export DUCKDNS_DOMAINS=$(systemd-creds cat DUCKDNS_DOMAINS_FILE | sed -z 's/\n/,/g')
+        ''}
+        curl --no-progress-meter -k "https://www.duckdns.org/update?domains=$DUCKDNS_DOMAINS&token=$DUCKDNS_TOKEN&ip=" | grep -v "KO"
+      '';
     };
   };