diff --git a/youtube_dl/extractor/limelight.py b/youtube_dl/extractor/limelight.py
index da5d198b9..a25fb8e2c 100644
--- a/youtube_dl/extractor/limelight.py
+++ b/youtube_dl/extractor/limelight.py
@@ -98,7 +98,7 @@ class LimelightBaseIE(InfoExtractor):
         } for thumbnail in properties.get('thumbnails', []) if thumbnail.get('url')]
 
         subtitles = {}
-        for caption in properties.get('captions', {}):
+        for caption in properties.get('captions', []):
             lang = caption.get('language_code')
             subtitles_url = caption.get('url')
             if lang and subtitles_url: