diff -r cecf279f28a6 -r ab50b62aa21b src/pyams_media/zmi/templates/audio-preview.pt
--- a/src/pyams_media/zmi/templates/audio-preview.pt	Fri Jan 18 15:34:46 2019 +0100
+++ b/src/pyams_media/zmi/templates/audio-preview.pt	Mon Feb 18 16:08:57 2019 +0100
@@ -8,7 +8,7 @@
 	<video
 		tal:define="href tales:absolute_url(context);
 					conversions tales:conversions(context);">
-		<tal:loop repeat="conversion conversions.get_conversions(order=('audio/ogg', 'audio/mpeg', 'audio/wav'))">
+		<tal:loop repeat="conversion conversions.get_conversions(order=('audio/mpeg','audio/ogg','audio/wav'))">
 			<source type="audio/ogg"
 					tal:define="audio_type tales:audio_type(conversion);"
 					tal:condition="audio_type"