diff --git a/webvirtcloud/settings.py.template b/webvirtcloud/settings.py.template
index ffee758..aebe2f0 100644
--- a/webvirtcloud/settings.py.template
+++ b/webvirtcloud/settings.py.template
@@ -143,6 +143,7 @@ SHOW_PROFILE_EDIT_PASSWORD = False
 # available: default (grid), list
 VIEW_ACCOUNTS_STYLE = 'grid'
 
+INSTANCE_VOLUME_DEFAULT_FILE_EXTENSION = 'qcow2'
 INSTANCE_VOLUME_DEFAULT_FORMAT = 'qcow2'
 INSTANCE_VOLUME_DEFAULT_BUS = 'virtio'
 INSTANCE_VOLUME_DEFAULT_CACHE = 'directsync'