Omit output of a factor variable in stargazer?

If I'm running a fixed effects model in r using lm and the factor command, how can I suppress the factor variable coefficients in a stargazer model?

i.e. my model is:

m1<-lm(GDP~pop_growth + factor(city))

and I want to report findings with only an intercept and coefficient on pop_growth, not coefficients on every dummy variable for cities.

EDIT: Issue was, as it turns out, with variable name encoding. omit="city" works.