diff --git a/plugins/RSS/plugin.py b/plugins/RSS/plugin.py
index 840671a75..deaf308f0 100644
--- a/plugins/RSS/plugin.py
+++ b/plugins/RSS/plugin.py
@@ -286,13 +286,17 @@ class RSS(callbacks.Plugin):
             self.update_feed_if_needed(feed)
 
     def get_new_entries(self, feed):
+        # http://validator.w3.org/feed/docs/rss2.html#hrelementsOfLtitemgt
+        get_id = lambda entry: entry.id if hasattr(entry, 'id') else (
+                entry.title if hasattr(entry, 'title') else entry.description)
+
         with feed.lock:
             entries = feed.entries
             new_entries = [entry for entry in entries
-                    if entry.id not in feed.announced_entries]
+                    if get_id(entry) not in feed.announced_entries]
             if not new_entries:
                 return []
-            feed.announced_entries |= set(entry.id for entry in new_entries)
+            feed.announced_entries |= set(get_id(entry) for entry in new_entries)
             # We keep a little more because we don't want to re-announce
             # oldest entries if one of the newest gets removed.
             feed.announced_entries.truncate(10*len(entries))