diff --git a/weboob/capabilities/audio.py b/weboob/capabilities/audio.py
index 20802efd..25e7abbe 100644
--- a/weboob/capabilities/audio.py
+++ b/weboob/capabilities/audio.py
@@ -31,7 +31,6 @@ class BaseAudio(BaseFile):
     """
     Represent an audio file
     """
-    ext =       StringField('Audio file extension')
     duration =  Field('Audio file duration', int, long, timedelta)
     bitrate =   Field('Audio stream bit rate un Kbps', int)
     format =    StringField('Audio stream format')
diff --git a/weboob/capabilities/file.py b/weboob/capabilities/file.py
index 48f256b8..195de67f 100644
--- a/weboob/capabilities/file.py
+++ b/weboob/capabilities/file.py
@@ -30,6 +30,7 @@ class BaseFile(CapBaseObject):
     """
     title =         StringField('File title')
     url =           StringField('File URL')
+    ext =           StringField('File extension')
     author =        StringField('File author')
     description =   StringField('File description')
     date =          DateField('File publication date')