When setting up Wi-Fi for your company’s computers, it’s crucial to rethink why security is important. Most small business owners try to safeguard against sensitive information being stolen, but they don’t always think about other security risks: If someone taps into your business’s Wi-Fi, anything that person does online—from annoying spam to illegal activity—looks like it’s coming from your business. Such a lapse could make your business look bad or damage your reputation.

If your business doesn’t have the IT capability to deploy a secured 802.1x WLAN, an easy way to add security to your home-office Wi-Fi is to use a strong password (12 characters long or longer, using WPA2 encryption) for your wireless access point and to implement Media Access Control (MAC) address filters. With MAC address filters, you go into your wireless router and enter a unique 16-digit number for every device you want to be able to access your Wi-Fi, and those are the only devices that will be able to get access. Even if someone manages to find out the 16-digit number, that person won’t be able to connect without using the device the number was set up for.

“Using MAC address filters is ideal in a small environment, like for a small business,” says Kelly Joyce, information security director for publisher Pace Communications. “It only requires one extra step.” But this extra measure can help keep hackers off your network and give your business a little extra protection.