diff --git a/lib/client/http-tracker.js b/lib/client/http-tracker.js
index 5f14a37d..97a0a327 100644
--- a/lib/client/http-tracker.js
+++ b/lib/client/http-tracker.js
@@ -225,10 +225,12 @@ class HTTPTracker extends Tracker {
   _onScrapeResponse (data) {
     // NOTE: the unofficial spec says to use the 'files' key, 'host' has been
     // seen in practice
+    const raw = data
     data = data.files || data.host || {}
 
     const keys = Object.keys(data)
     if (keys.length === 0) {
+      console.debug(raw)
       this.client.emit('warning', new Error('invalid scrape response'))
       return
     }