diff --git a/packages/dart_mapper_generator/lib/src/factories/default_expression_factory.dart b/packages/dart_mapper_generator/lib/src/factories/default_expression_factory.dart
index 49cf2d0..6f03957 100644
--- a/packages/dart_mapper_generator/lib/src/factories/default_expression_factory.dart
+++ b/packages/dart_mapper_generator/lib/src/factories/default_expression_factory.dart
@@ -152,7 +152,7 @@ class DefaultExpressionFactory extends ExpressionFactory {
   ) {
     final sourceExpression = super.sourceOnly(context);
 
-    Expression _buildDefaultExpr() => context.counterpartField.type.isDartCoreString
+    Expression buildDefaultExpr() => context.counterpartField.type.isDartCoreString
         ? literalString(context.defaultValue!)
         : CodeExpression(Code(context.defaultValue!));
 
@@ -160,7 +160,7 @@ class DefaultExpressionFactory extends ExpressionFactory {
       final submapperCall =
           refer(extraMethod.name).call([sourceExpression.nullChecked]);
       if (context.defaultValue != null) {
-        final defaultExpr = _buildDefaultExpr();
+        final defaultExpr = buildDefaultExpr();
         return sourceExpression.isNotNull.conditional(
           submapperCall.ifNullThen(defaultExpr),
           defaultExpr,
@@ -171,7 +171,7 @@ class DefaultExpressionFactory extends ExpressionFactory {
 
     final submapperCall = refer(extraMethod.name).call([sourceExpression]);
     if (context.defaultValue != null) {
-      return submapperCall.ifNullThen(_buildDefaultExpr());
+      return submapperCall.ifNullThen(buildDefaultExpr());
     }
 
     return submapperCall;
diff --git a/packages/dart_mapper_generator/pubspec.yaml b/packages/dart_mapper_generator/pubspec.yaml
index b18ec72..5350622 100644
--- a/packages/dart_mapper_generator/pubspec.yaml
+++ b/packages/dart_mapper_generator/pubspec.yaml
@@ -15,7 +15,7 @@ environment:
 
 # Add regular dependencies here.
 dependencies:
-  analyzer: ^12.0.0
+  analyzer: ">=12.0.0 <14.0.0"
   build: ^4.0.0
   code_builder: ^4.10.1
   dart_style: ^3.1.0