"Lenger" or "Lengere" meaning "Any More."

Norwegian 5, Lesson 14:

I have a problem with the following:-

“… men ikke nå lenger…” meaning “but not anymore”

and

“vi brukte å eie en forretning, men ikke nå lengere” meaning “we used to own a business, but not anymore.”

Why is it that in the second instance, an extra “e” for the word “lenger” is added in the sentence?

I’ve moved your posting to the course’s forum-thread: [Course Forum] Norwegian 1-7 by Memrise