diff --git a/youtube_dl/extractor/animelab.py b/youtube_dl/extractor/animelab.py
index ed3144176..d096fd5fc 100644
--- a/youtube_dl/extractor/animelab.py
+++ b/youtube_dl/extractor/animelab.py
@@ -33,6 +33,7 @@ class AnimeLabIE(InfoExtractor):
             'series': 'Fullmetal Alchemist: Brotherhood',
             'episode': 'Signs of a Counteroffensive',
             'episode_number': 42,
+            'duration': 1469,
         },
         'params': {
             'format': '[format_id=21711_yeshardsubbed_ja-JP][height=480]',