diff --git a/homeassistant/components/flo/entity.py b/homeassistant/components/flo/entity.py
index 066ffef6a054b9..2745f5f9fb7d2b 100644
--- a/homeassistant/components/flo/entity.py
+++ b/homeassistant/components/flo/entity.py
@@ -32,6 +32,7 @@ def device_info(self) -> DeviceInfo:
         return DeviceInfo(
             connections={(CONNECTION_NETWORK_MAC, self._device.mac_address)},
             identifiers={(FLO_DOMAIN, self._device.id)},
+            serial_number=self._device.serial_number,
             manufacturer=self._device.manufacturer,
             model=self._device.model,
             name=self._device.device_name.capitalize(),