# System-wide over-delivery

An over-delivery percentage can be configured. For example, if set to 2%, each campaign will deliver 2% more impressions than initially booked. An over-delivery percentage is applied to prevent minimal under-delivery of third-party ads in the event of reporting [discrepancies](https://documentation.adhese.org/books/troubleshooting/page/general-troubleshooting)

<p class="callout info">Don't hesitate to contact support if you want to increase or decrease your system-wide over-delivery percentage.</p>

<p class="callout success">The default overdelivery value is 5%</p>