Car seat on trip to Europe -- seatbelts don't lock out like in US?

I'm in Spain for a trip and I tried to attach our carseat to the cab's seatbelt as I've done many times before in the US, to discover that the belt doesn't "lock out" when pulled all the way. I tried a second cab and it was the same. Is there something I'm missing, or do I somehow need to acquire a locking clip and learned to use that on the next cab?Car seat I'm using is the Graco Snugride Click Connect 35 (without the base). via /r/Parenting http://ift.tt/2kQNxgX