diff --git a/beetsplug/itunes.py b/beetsplug/itunes.py
index 8d1a297..4a00c90 100644
--- a/beetsplug/itunes.py
+++ b/beetsplug/itunes.py
@@ -235,6 +235,8 @@ class iTunesPlugin(BeetsPlugin):
     
     def apply_itunes_metadata(self, session, task):
         for item in task.imported_items():
+            if item.data_source != 'iTunes':
+                continue
             info = task.match.mapping[item]
             for tag in ['genre', 'title_sort', 'album_sprt', 'itunes_content_id', 'itunes_artist_id', 'itunes_advisory']:
                 item[tag] = getattr(info, tag, None)