After signs of encouragement following four straight wins and impressing for the majority of the game against Leicester, Arsenal were brought back down to earth by bitter rivals Tottenham.
Following a fine strike from Alexandre Lacazette, Arsenal's defence - Sead Kolasinac in particular - gifted Tottenham an equaliser just moments later before conceding from a corner as Spurs ran out 2-1 winners in Sunday's north London derby.
It served as a wake-up call yet again for the Gunners, and for the defence old habits certainly die hard.
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While there has been hope in recent times of some sort of revival at the Emirates, Mikel Arteta knows he has plenty of work to do to somehow improve his defence if Arsenal want to be challenging for a top-four spot once again.