Getting last element of the Collection

guys, I'm trying to get the last element from the data returned to me but the problem is that it is throwing me an error which is

Call to undefined method Illuminate\Database\Query\Builder::last()

Here is my code

$last_saved_snapshot = \EnginePerformanceTestSnapshot::where('engine_performance_test_id', $id)->last();

Please tell me what is it that I'm doing wrong. Thanks

P.S I'm using Laravel 5.0

via Chebli Mohamed