diff --git a/ox/movie.py b/ox/movie.py
index ed44835..6229da3 100644
--- a/ox/movie.py
+++ b/ox/movie.py
@@ -158,7 +158,7 @@ def parse_item_files(files):
         for extension in EXTENSIONS['subtitle']:
             subtitle_files = [file for file in version_files[version_key] if file['extension'] == extension]
             subtitle_languages = set([file['language'] for file in subtitle_files])
-            if len(subtitle_languages) == 1 and subtitle_languages[0] == LANGUAGES[0]:
+            if len(subtitle_languages) == 1 and LANGUAGES[0] in subtitle_languages:
                 for subtitle_file in subtitle_files:
                     subtitle_file['normalizedPath'] = format_path(dict(subtitle_file, **{'language': None}))
     # return data