diff --git a/youtube_dl/extractor/firsttv.py b/youtube_dl/extractor/firsttv.py
index 4463d3d207..47673e2d44 100644
--- a/youtube_dl/extractor/firsttv.py
+++ b/youtube_dl/extractor/firsttv.py
@@ -107,7 +107,7 @@ def _real_extract(self, url):
                 'ya:ovs:upload_date', webpage, 'upload date', default=None))
 
             entries.append({
-                'id': item.get('id') or uid,
+                'id': compat_str(item.get('id') or item['uid']),
                 'thumbnail': thumbnail,
                 'title': title,
                 'upload_date': upload_date,