diff --git a/angel_serialize_generator/CHANGELOG.md b/angel_serialize_generator/CHANGELOG.md
index 03798661..ab2bd968 100644
--- a/angel_serialize_generator/CHANGELOG.md
+++ b/angel_serialize_generator/CHANGELOG.md
@@ -4,6 +4,7 @@
 * Support pulling fields from parent classes and interfaces.
 * Only generate `const` constructors if *all*
 fields lack a setter.
+* Don't type-annotate initializing formals.
 
 # 2.4.4
 * Remove unnecessary `new` and `const`.
diff --git a/angel_serialize_generator/lib/model.dart b/angel_serialize_generator/lib/model.dart
index 01d5ec16..55691d78 100644
--- a/angel_serialize_generator/lib/model.dart
+++ b/angel_serialize_generator/lib/model.dart
@@ -141,7 +141,7 @@ class JsonModelGenerator extends GeneratorForAnnotation<Serializable> {
 
           if (!isListOrMapType(field.type)) {
             b.toThis = true;
-          } else {
+          } else if (!b.toThis) {
             b.type = convertTypeReference(field.type);
           }
 
diff --git a/angel_serialize_generator/test/models/goat.g.dart b/angel_serialize_generator/test/models/goat.g.dart
index 0c0659e0..a58ddcda 100644
--- a/angel_serialize_generator/test/models/goat.g.dart
+++ b/angel_serialize_generator/test/models/goat.g.dart
@@ -8,7 +8,7 @@ part of 'goat.dart';
 
 @generatedSerializable
 class Goat implements _Goat {
-  const Goat({this.integer = 34, List<int> this.list = const [34, 35]});
+  const Goat({this.integer = 34, this.list = const [34, 35]});
 
   @override
   final int integer;
diff --git a/angel_serialize_generator/test/models/has_map.g.dart b/angel_serialize_generator/test/models/has_map.g.dart
index d3adbddd..300730c7 100644
--- a/angel_serialize_generator/test/models/has_map.g.dart
+++ b/angel_serialize_generator/test/models/has_map.g.dart
@@ -8,7 +8,7 @@ part of 'has_map.dart';
 
 @generatedSerializable
 class HasMap implements _HasMap {
-  const HasMap({@required Map<dynamic, dynamic> this.value});
+  const HasMap({@required this.value});
 
   @override
   final Map<dynamic, dynamic> value;
diff --git a/angel_serialize_generator/test/models/with_enum.g.dart b/angel_serialize_generator/test/models/with_enum.g.dart
index 59c63ddc..13c21eb5 100644
--- a/angel_serialize_generator/test/models/with_enum.g.dart
+++ b/angel_serialize_generator/test/models/with_enum.g.dart
@@ -8,8 +8,7 @@ part of 'with_enum.dart';
 
 @generatedSerializable
 class WithEnum implements _WithEnum {
-  const WithEnum(
-      {this.type = WithEnumType.b, List<int> this.finalList, this.imageBytes});
+  const WithEnum({this.type = WithEnumType.b, this.finalList, this.imageBytes});
 
   @override
   final WithEnumType type;