diff --git a/ox/file.py b/ox/file.py
index ecddc0a..1d92024 100644
--- a/ox/file.py
+++ b/ox/file.py
@@ -17,7 +17,7 @@ __all__ = ['sha1sum', 'oshash', 'avinfo', 'makedirs']
 
 EXTENSIONS = {
     'audio': [
-        'aac', 'aif', 'aiff',
+        'aac', 'aif', 'aiff', 'amr',
         'flac', 'm4a', 'mp3', 'oga', 'ogg', 'wav', 'wma'
     ],
     'image': [