Restoration work was carried out in the 19th century under the direction of the architect Tilman-François Suys who restored the towers and portals from 1839 to 1845, and again in the 20th century under the direction of Jean Rombaux, then Victor Gaston Martiny, chief architect-town planner of the Province of Brabant and member of the Royal Committee for Monuments and Sites. The cathedral was once again thoroughly restored between 1983 and 1999. On that occasion, remains of the Romanesque church and crypt were discovered underneath the current choir.