diff --git a/lib/chewy/type/import.rb b/lib/chewy/type/import.rb
index 53b5d44fa..7a369fed2 100644
--- a/lib/chewy/type/import.rb
+++ b/lib/chewy/type/import.rb
@@ -76,10 +76,10 @@ def bulk options = {}
       private
 
         def bulk_body(action_objects, indexed_objects = nil)
-          action_objects.inject([]) do |result, (action, objects)|
+          action_objects.flat_map do |action, objects|
             method = "#{action}_bulk_entry"
             crutches = Chewy::Type::Crutch::Crutches.new self, objects
-            result.concat(objects.map { |object| send(method, object, indexed_objects, crutches) }.flatten)
+            objects.flat_map { |object| send(method, object, indexed_objects, crutches) }
           end
         end