diff --git a/youtube_dl/extractor/fktv.py b/youtube_dl/extractor/fktv.py
index fb9739b49d..40ea278952 100644
--- a/youtube_dl/extractor/fktv.py
+++ b/youtube_dl/extractor/fktv.py
@@ -45,7 +45,7 @@ class FKTVIE(InfoExtractor):
         urls = re.findall(r'<source[^>]+src="([^"]+)"', sources)
         formats = [{
             'url': furl,
-            'format_id': determine_ext(url),
+            'format_id': determine_ext(furl),
         } for furl in urls]
         return {
             'id': episode,