The Clash - Should I stay or should I go

[jono]

At the end of the chorus in the book there is one bar of A before the ADGD riff. (A | A D G | D)
I am struggling to fit only one bar in and two bars seems to fit better. (A | A |A D G| D
Do I need to adjust my ears and strum it a bit slower or has Justin left a bar of A out.