diff --git a/activerecord/lib/active_record/nested_attributes.rb b/activerecord/lib/active_record/nested_attributes.rb
index a8ee43b5985f8d1b2a2e958bf215e451f883425b..9e21039c4f8fcd7056a2ba6c515ed4d8498871a1 100644
--- a/activerecord/lib/active_record/nested_attributes.rb
+++ b/activerecord/lib/active_record/nested_attributes.rb
@@ -382,7 +382,7 @@ def assign_nested_attributes_for_collection_association(association_name, attrib
       if attributes_collection.is_a? Hash
         keys = attributes_collection.keys
         attributes_collection = if keys.include?('id') || keys.include?(:id)
-          Array.wrap(attributes_collection)
+          [attributes_collection]
         else
           attributes_collection.values
         end