diff --git a/packages/dart_mappable/lib/src/case_style.dart b/packages/dart_mappable/lib/src/case_style.dart
index 02079b4..4a39529 100644
--- a/packages/dart_mappable/lib/src/case_style.dart
+++ b/packages/dart_mappable/lib/src/case_style.dart
@@ -89,6 +89,9 @@ class CaseStyle {
 
   /// Transforms to 'FIELDNAME'
   static const upperCase = CaseStyle(tail: TextTransform.upperCase);
+
+  /// Transforms to 'FIELD_NAME'
+  static const upperSnakeCase = CaseStyle(tail: TextTransform.upperCase, separator: '_');
 }
 
 extension CaseStyleTransform on CaseStyle? {