Grammar and negations

Bonjour Birdies,

https://www.wordreference.com/fren/souvenir

Have a look at the above link. You will find the verb souvenir takes the preposition de after it.

This takes the sense of memory/recollection/reminder (or not) of something or other.

Hope this helps.

Bonne continuation.

Jim

Se souvenir de quelque chose -- to remember something

As you can see, the preposition de follows the verb souvenir and precedes the thing that is remembered.