diff --git a/angel_serialize_generator/lib/serialize.dart b/angel_serialize_generator/lib/serialize.dart
index 35c6632c..e9a506c6 100644
--- a/angel_serialize_generator/lib/serialize.dart
+++ b/angel_serialize_generator/lib/serialize.dart
@@ -64,7 +64,7 @@ class SerializerGenerator extends GeneratorForAnnotation<Serializable> {
       // Add named parameters
       for (var field in ctx.fields) {
         // Skip excluded fields
-        if (ctx.excluded.containsKey(field.name)) continue;
+        if (ctx.excluded[field.name] == true) continue;
 
         var alias = ctx.resolveFieldName(field.name);
 
diff --git a/angel_serialize_generator/test/models/author.serializer.g.dart b/angel_serialize_generator/test/models/author.serializer.g.dart
index 8f0d0015..7a4945ae 100644
--- a/angel_serialize_generator/test/models/author.serializer.g.dart
+++ b/angel_serialize_generator/test/models/author.serializer.g.dart
@@ -10,6 +10,10 @@ abstract class AuthorSerializer {
   Map<String, dynamic> toMap() {
     return {
       'id': id,
+      'name': name,
+      'age': age,
+      'books': books,
+      'newest_book': newestBook,
       'created_at': createdAt.toIso8601String(),
       'updated_at': updatedAt.toIso8601String()
     };
@@ -20,6 +24,7 @@ abstract class LibrarySerializer {
   Map<String, dynamic> toMap() {
     return {
       'id': id,
+      'collection': collection,
       'created_at': createdAt.toIso8601String(),
       'updated_at': updatedAt.toIso8601String()
     };
diff --git a/angel_serialize_generator/test/models/book.serializer.g.dart b/angel_serialize_generator/test/models/book.serializer.g.dart
index 1e069c7e..d6e83f55 100644
--- a/angel_serialize_generator/test/models/book.serializer.g.dart
+++ b/angel_serialize_generator/test/models/book.serializer.g.dart
@@ -10,6 +10,10 @@ abstract class BookSerializer {
   Map<String, dynamic> toMap() {
     return {
       'id': id,
+      'author': author,
+      'title': title,
+      'description': description,
+      'page_count': pageCount,
       'created_at': createdAt.toIso8601String(),
       'updated_at': updatedAt.toIso8601String()
     };