diff --git a/lib/src/constructor_declaration.dart b/lib/src/constructor_declaration.dart
index 206c426..69ab322 100644
--- a/lib/src/constructor_declaration.dart
+++ b/lib/src/constructor_declaration.dart
@@ -13,7 +13,19 @@ Map<String, dynamic>? serializeConstructorDeclaration(
       hasPrivateAnnotation(annotations)) {
     return null;
   }
-  final className = (constructor.parent! as ClassDeclaration).name.lexeme;
+  final String className;
+
+  if (constructor.parent is ClassDeclaration) {
+    className = (constructor.parent! as ClassDeclaration).name.lexeme;
+  } else if (constructor.parent is EnumDeclaration) {
+    className = (constructor.parent! as EnumDeclaration).name.lexeme;
+  } else {
+    throw UnsupportedError(
+      'Constructor parent is neither ClassDeclaration nor EnumDeclaration. '
+      'It is ${constructor.parent.runtimeType}',
+    );
+  }
+
   final constructorName = constructor.name == null
       ? className
       : '$className.${constructor.name!.lexeme}';
diff --git a/test/enum_declaration_test.dart b/test/enum_declaration_test.dart
index 9b269b3..40b3800 100644
--- a/test/enum_declaration_test.dart
+++ b/test/enum_declaration_test.dart
@@ -96,4 +96,26 @@ void main() {
       );
     });
   });
+
+  test('enum with constructor', () {
+    expect(
+      parseAsJson('''
+          enum Abc {
+            a;
+            
+           const Abc();
+          }
+        '''),
+      {
+        'kind': 'enum',
+        'name': 'Abc',
+        'values': [
+          {'name': 'a'},
+        ],
+        'members': [
+          {'kind': 'constructor', 'name': 'Abc', 'const': true},
+        ],
+      },
+    );
+  });
 }