The suspect is "charged with complicity in the perpetrator's actions" and will appear before a judge tomorrow for a custody hearing, police said in a statement.
Two other men who allegedly helped gunmen Omar El-Hussein were arrested shortly after the February 14-14 attacks and have been ordered to be detained until March 26.
El-Hussein was shot dead by police after his shooting spree that send fresh shockwaves across Europe after the Islamist attacks in Paris in January.
El-Hussein had been released from prison two weeks before the attacks after serving a term for aggravated assault, raising fears he may have become radicalised behind bars.