transforming predicted values of a glmm lme4

Dear list,

I calculated predicted values from a poisson glmm (glmer) like this:

predvals <- model.matrix ( terms ( fm1 ) , data2 ) %*% fixef ( fm1 )

whereas fm1 is my model & data2 is my new dataframe used for prediction.

When using the predict function, e.g. for glms, there is the option to set 
type="response", which is nice, as you get your predicted values on the scale 
of the response variable. Which means counts in my case. 

Alas, there is obviously no such possibility for a mer-object in lme4 and my 
question is how I can transform my predicted values "by hand" to the scale of 
the response variable.

Thanks in advance & cheers
Michael