diff --git a/example/.packages b/example/.packages
index 8cc6037..f520f93 100644
--- a/example/.packages
+++ b/example/.packages
@@ -3,7 +3,7 @@
 # 
 # For more info see: https://dart.dev/go/dot-packages-deprecation
 # 
-# Generated by pub on 2022-08-09 15:30:02.206771.
+# Generated by pub on 2022-08-12 11:14:37.192298.
 _fe_analyzer_shared:file:///C:/Users/nymsa/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/_fe_analyzer_shared-44.0.0/lib/
 analyzer:file:///C:/Users/nymsa/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/analyzer-4.4.0/lib/
 args:file:///C:/Users/nymsa/AppData/Local/Pub/Cache/hosted/pub.dartlang.org/args-2.1.1/lib/
diff --git a/example/lib/list/list.dart b/example/lib/list/list.dart
index 5446100..3b7375a 100644
--- a/example/lib/list/list.dart
+++ b/example/lib/list/list.dart
@@ -6,8 +6,9 @@ part 'list.mapper.g.dart';
 class Source {
   final List<int> intList;
   final List<SourceEntry> entryList;
+  final List<String> propList;
 
-  Source(this.intList, this.entryList);
+  Source(this.intList, this.entryList, this.propList);
 }
 
 class SourceEntry {
@@ -32,6 +33,10 @@ class TargetEntry {
 
 @Mapper()
 abstract class ListMapper {
+  static List<String> _mapPropList(Source source) =>
+      source.entryList.map((e) => e.prop).toList();
+
+  @Mapping(target: 'propList', source: _mapPropList)
   Target fromSource(Source source);
   TargetEntry fromSourceEntry(SourceEntry source);
 }
diff --git a/generator/lib/code_builders/class_builder.dart b/generator/lib/code_builders/class_builder.dart
index 7b493fa..fa67f74 100644
--- a/generator/lib/code_builders/class_builder.dart
+++ b/generator/lib/code_builders/class_builder.dart
@@ -31,7 +31,10 @@ bool _isPrimitive(DartType type) {
       type.isDartCoreInt ||
       type.isDartCoreNum ||
       type.isDartCoreString ||
-      (type is InterfaceType && type.superclass?.isDartCoreEnum == true);
+      (type is InterfaceType && type.superclass?.isDartCoreEnum == true) ||
+      type.isDartCoreList ||
+      type.isDartCoreSet ||
+      type.isDartCoreMap;
 }
 
 Class _generateMapperImplementationClass(