diff --git a/plugins/file/file_req.c b/plugins/file/file_req.c
index 49459d39..36d8a8f5 100644
--- a/plugins/file/file_req.c
+++ b/plugins/file/file_req.c
@@ -32,6 +32,10 @@ static void plugin_group_free(neu_plugin_group_t *pgp);
 
 int file_group_timer(neu_plugin_t *plugin, neu_plugin_group_t *group)
 {
+    neu_adapter_update_metric_cb_t update_metric =
+        plugin->common.adapter_callbacks->update_metric;
+    int64_t rtt = NEU_METRIC_LAST_RTT_MS_MAX;
+
     struct file_group_data *gd     = NULL;
     int                     length = plugin->file_length;
 
@@ -83,6 +87,8 @@ int file_group_timer(neu_plugin_t *plugin, neu_plugin_group_t *group)
         strncpy(dvalue.value.str, buf, strlen(buf));
         fclose(f);
 
+        rtt = 1;
+
     dvalue_result:
         plugin->common.adapter_callbacks->driver.update(
             plugin->common.adapter, group->group_name, tag->name, dvalue);
@@ -90,6 +96,8 @@ int file_group_timer(neu_plugin_t *plugin, neu_plugin_group_t *group)
         free(buf);
     }
 
+    update_metric(plugin->common.adapter, NEU_METRIC_LAST_RTT_MS, rtt, NULL);
+
     return 0;
 }