diff --git a/td-agent.conf b/td-agent.conf
index 5345258..514496a 100644
--- a/td-agent.conf
+++ b/td-agent.conf
@@ -26,8 +26,14 @@
     path /var/log/containers/${tag}
     append true
     <buffer tag>
+      @type file
+      path /var/log/containers/buffer
       flush_interval 0s
     </buffer>
+    <format>
+      @type single_value
+      message_key log
+    </format>
   </store>
   <store>
     @type rewrite_tag_filter