diff --git a/lib/src/builders/message/attachment.dart b/lib/src/builders/message/attachment.dart
index 45be187c2..07be6241e 100644
--- a/lib/src/builders/message/attachment.dart
+++ b/lib/src/builders/message/attachment.dart
@@ -8,11 +8,11 @@ import 'package:nyxx/src/models/message/attachment.dart';
 class AttachmentBuilder extends Builder<Attachment> {
   List<int> data;
 
-  String? fileName;
+  String fileName;
 
   String? description;
 
-  AttachmentBuilder({required this.data, this.fileName, this.description});
+  AttachmentBuilder({required this.data, required this.fileName, this.description});
 
   static Future<AttachmentBuilder> fromFile(File file, {String? description}) async {
     final data = await file.readAsBytes();
@@ -26,7 +26,7 @@ class AttachmentBuilder extends Builder<Attachment> {
 
   @override
   Map<String, Object?> build() => {
-        if (fileName != null) 'filename': fileName,
+        'filename': fileName,
         if (description != null) 'description': description,
       };
 }