In Wheelock chapter 3, we find the following translation Latin-to-English exercise:

10.  Sēcrētē amīcōs admonē; laudā palam. 

I'm wondering about the accent on the word admonē.  Should it be penultimate (admónē) or antepenultimate (ádmonē)?  Of course, the form of monē is penultimate, since it's a two-syllable word.  By the regular rules, I would expect it to be antepenultimate.  Is there something special in the word because it has a prefix (ad-monēre)?