diff --git a/lib/administrate/field/nested_has_many.rb b/lib/administrate/field/nested_has_many.rb
index 5cfd3ee..6c1c962 100644
--- a/lib/administrate/field/nested_has_many.rb
+++ b/lib/administrate/field/nested_has_many.rb
@@ -39,7 +39,7 @@ def nested_fields_for_builder(form_builder)
           next if nested_field.resource.blank?
 
           # inject current data into field
-          resource = data[form_builder.index]
+          resource = form_builder.object
           nested_field.instance_variable_set(
             "@data",
             resource.send(nested_field.attribute),