diff --git a/actionview/lib/action_view/helpers/form_helper.rb b/actionview/lib/action_view/helpers/form_helper.rb
index 3a9acafaa2..32765c1aaa 100644
--- a/actionview/lib/action_view/helpers/form_helper.rb
+++ b/actionview/lib/action_view/helpers/form_helper.rb
@@ -1617,7 +1617,14 @@ def fields_for(record_name, record_object = nil, fields_options = {}, &block)
           @auto_index
         end
 
-        record_name = index ? "#{object_name}[#{index}][#{record_name}]" : "#{object_name}[#{record_name}]"
+        record_name = if index
+                        "#{object_name}[#{index}][#{record_name}]"
+                      elsif record_name.to_s.end_with?('[]')
+                        record_name = record_name.to_s.sub(/(.*)\[\]$/, "[\\1][#{record_object.id}]")
+                        "#{object_name}#{record_name}"
+                      else
+                        "#{object_name}[#{record_name}]"
+                      end
         fields_options[:child_index] = index
 
         @template.fields_for(record_name, record_object, fields_options, &block)
diff --git a/actionview/test/template/form_helper_test.rb b/actionview/test/template/form_helper_test.rb
index aef137935a..659338e22b 100644
--- a/actionview/test/template/form_helper_test.rb
+++ b/actionview/test/template/form_helper_test.rb
@@ -2292,6 +2292,27 @@ def test_nested_fields_for
     assert_dom_equal expected, output_buffer
   end
 
+  def test_deep_nested_fields_for
+    @comment.save
+    form_for(:posts) do |f|
+      f.fields_for('post[]', @post) do |f2|
+        f2.text_field(:id)
+        @post.comments.each do |comment|
+          concat f2.fields_for('comment[]', comment) { |c|
+            concat c.text_field(:name)
+          }
+        end
+      end
+    end
+
+    expected = whole_form do
+      "<input name='posts[post][0][comment][1][name]' type='text' id='posts_post_0_comment_1_name' value='comment #1' />"
+    end
+
+    assert_dom_equal expected, output_buffer
+  end
+
+
   def test_nested_fields_for_with_nested_collections
     form_for(@post, as: 'post[]') do |f|
       concat f.text_field(:title)