diff --git a/homeassistant/components/bbox/sensor.py b/homeassistant/components/bbox/sensor.py
index 129803ad1e1..fc9c8982733 100644
--- a/homeassistant/components/bbox/sensor.py
+++ b/homeassistant/components/bbox/sensor.py
@@ -131,10 +131,9 @@ class BboxUptimeSensor(SensorEntity):
     def update(self):
         """Get the latest data from Bbox and update the state."""
         self.bbox_data.update()
-        uptime = utcnow() - timedelta(
+        self._attr_native_value = utcnow() - timedelta(
             seconds=self.bbox_data.router_infos["device"]["uptime"]
         )
-        self._attr_native_value = uptime.replace(microsecond=0)
 
 
 class BboxSensor(SensorEntity):