diff --git a/nixos/modules/services/monitoring/telegraf.nix b/nixos/modules/services/monitoring/telegraf.nix
index 1fc17ec72da..b341a9005c2 100644
--- a/nixos/modules/services/monitoring/telegraf.nix
+++ b/nixos/modules/services/monitoring/telegraf.nix
@@ -21,7 +21,7 @@ in {
       };
 
       environmentFiles = mkOption {
-        type = types.nullOr (types.listOf types.path);
+        type = types.listOf types.path;
         default = [];
         example = "/run/keys/telegraf.env";
         description = ''
@@ -38,17 +38,13 @@ in {
         description = "Extra configuration options for telegraf";
         type = settingsFormat.type;
         example = {
-          outputs = {
-            influxdb = {
-              urls = ["http://localhost:8086"];
-              database = "telegraf";
-            };
+          outputs.influxdb = {
+            urls = ["http://localhost:8086"];
+            database = "telegraf";
           };
-          inputs = {
-            statsd = {
-              service_address = ":8125";
-              delete_timings = true;
-            };
+          inputs.statsd = {
+            service_address = ":8125";
+            delete_timings = true;
           };
         };
       };
diff --git a/nixos/tests/telegraf.nix b/nixos/tests/telegraf.nix
index 938bbd518b5..7f4b3675258 100644
--- a/nixos/tests/telegraf.nix
+++ b/nixos/tests/telegraf.nix
@@ -6,9 +6,9 @@ import ./make-test-python.nix ({ pkgs, ...} : {
 
   machine = { ... }: {
     services.telegraf.enable = true;
-    services.telegraf.environmentFiles = [pkgs.writeText "secrets" ''
+    services.telegraf.environmentFiles = [(pkgs.writeText "secrets" ''
       SECRET=example
-    ''];
+    '')];
     services.telegraf.extraConfig = {
       agent.interval = "1s";
       agent.flush_interval = "1s";