Since I generally play X as takeout of their major on these sequences I tend to pass here (although I'm open to other suggestions). It could be worse I suppose, since at least 1N is forcing in the common 2/1 style so I can bid again later. Without takeout shape however, I'm probably going to get fixed into passing.
Here's one example from the NAOP qualifier today:
In this particular case, the auction continued after my pass:
(1♠)-P-(1N*)-P * forcing NT
(2♣)-P-(P)-X takeout
(P)-2♦-(3♣)-3♦ wimpy 3♦?
(P)-P-(4♣)-X I think I'm beating this
AP
Here I wasn't sure how optimistic to be, but I settled on a meek 3♦ raise based on my good trumps

Help

(1♠)-P-(1N*)-?
* - forcing