diff --git a/lib/src/commands/service_generators/map.dart b/lib/src/commands/service_generators/map.dart
index ec7b1499..4b1dec7e 100644
--- a/lib/src/commands/service_generators/map.dart
+++ b/lib/src/commands/service_generators/map.dart
@@ -8,8 +8,8 @@ class MapServiceGenerator extends ServiceGenerator {
   bool get createsModel => false;
 
   @override
-  ExpressionBuilder createInstance(
+  Expression createInstance(
       MethodBuilder methodBuilder, String name, String lower) {
-    return new TypeBuilder('MapService').newInstance([]);
+    return refer('MapService').newInstance([]);
   }
 }