Help with standardized coefficients in lmer


I need to report standardized coefficients for the predictors in my model. I *think* I have figured out how to do this for my model of response time, by scaling all variables

e.g. RT.lmer = lmer(scale(RT) ~ scale(type) + scale(speed) + (1|subject) + (1|word), RTdata)

and then asking for the coefficients:


However, I can't figure out how to do this for my accuracy model. This is the regular model:

ACC.lmer = lmer(Acc ~ type + speed + (1|subject) + (1|word), fulldata, family=binomial)

It won't allow me to use scale on the accuracy scores. If I just scale the predictors then this does not give me the correct coefficients, because I am getting values greater than 1

Thanks in advance for your help!