diff --git a/youtube_dl/extractor/peertube.py b/youtube_dl/extractor/peertube.py
index 435a2bd71..32df14be3 100644
--- a/youtube_dl/extractor/peertube.py
+++ b/youtube_dl/extractor/peertube.py
@@ -500,12 +500,10 @@ class PeerTubeIE(InfoExtractor):
             language_id = try_get(entry, lambda x: x['language']['id'], compat_str)
             caption_path = str_or_none(entry.get('captionPath'))
             if language_id and caption_path:
-                caption_url = 'https://%s%s' % (host, caption_path)
-                caption_dict = {
-                    'url': caption_url
-                }
-                if subtitles.setdefault(language_id, [caption_dict]) != [caption_dict]:
-                    subtitles[language_id].append(caption_dict)
+                caption_url = urljoin('https://%s' % host, entry.get('captionPath'))
+                subtitles.setdefault(language_id, []).append({
+                    'url': caption_url,
+                })
         return subtitles
 
     def _real_extract(self, url):