During World War I both facilities sustained extensive damage, with restoration and re-installation taking several years to complete, the museum being reopened to the public as late as 1925.
In 1919 Malaquin was named chevalier of the Legion d'Honneur, and in 1937 became an officer (year of retirement).
A species of monstrillid copepod known as Cymbasoma malaquini (Caullery & Mesnil, 1914) is named after him.