What to do with dependent care fsa money if i am not eligible to use it due to non-working, non-full-time-student?

hi, i put in $2000 in dependent care FSA, and found that i am able to use it, because my wife does not work and only part-time in school. 

what shall i do with the $2000? 

what would happen to the $2000? would i add it to my w2? would i pay tax on it even though i can't use it?

(we file tax married jointly)

thanks!!