diff --git a/homeassistant/components/volvooncall/binary_sensor.py b/homeassistant/components/volvooncall/binary_sensor.py
index f08b4509bd1..7d2a9660703 100644
--- a/homeassistant/components/volvooncall/binary_sensor.py
+++ b/homeassistant/components/volvooncall/binary_sensor.py
@@ -16,7 +16,9 @@ class VolvoSensor(VolvoEntity, BinarySensorEntity):
 
     @property
     def is_on(self):
-        """Return True if the binary sensor is on."""
+        """Return True if the binary sensor is on, but invert for the 'Door lock'."""
+        if self.instrument.attr == "is_locked":
+            return not self.instrument.is_on
         return self.instrument.is_on
 
     @property