diff --git a/libmat2/audio.py b/libmat2/audio.py
index 3a6aa79..9b73031 100644
--- a/libmat2/audio.py
+++ b/libmat2/audio.py
@@ -36,4 +36,4 @@ class OGGParser(MutagenParser):
 
 
 class FLACParser(MutagenParser):
-    mimetypes = {'audio/flac', }
+    mimetypes = {'audio/flac', 'audio/x-flac' }