diff --git a/boards/models/attachment/viewers.py b/boards/models/attachment/viewers.py
--- a/boards/models/attachment/viewers.py
+++ b/boards/models/attachment/viewers.py
@@ -7,6 +7,7 @@ FILE_TYPES_VIDEO = (
     'webm',
     'mp4',
     'mpeg',
+    'ogv',
 )
 FILE_TYPE_SVG = 'svg'
 FILE_TYPES_AUDIO = (