diff --git a/nixos/modules/services/monitoring/telegraf.nix b/nixos/modules/services/monitoring/telegraf.nix
index 1fc17ec72daf..4bfede2e37ba 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 = ''