Workaround: Copy the default styles after the Mail Merge RadFlowDocument merged = sourceDocument.MailMerge(mailMergeSource); merged.DefaultStyle.ParagraphProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.ParagraphProperties); merged.DefaultStyle.CharacterProperties.CopyPropertiesFrom(sourceDocument.DefaultStyle.CharacterProperties); This item is migrated to the Telerik Document Processing portal: http://feedback.telerik.com/Project/184/Feedback/Details/190096 Please use the new item for commenting, voting and subscribing instead of this one.