An investigating judge charged Nourredine H., 33, with attempting to commit terrorist murder and taking part in the activities of a terrorist group, the federal prosecutor's office said.
He was arrested along with his brother Hamza H. Following raids in Belgium's French-speaking areas of Mons and Liege, but Hamza was released Saturday without charge, the office said in a statement.
Nourredine was placed in custody.
The prosecutor's office said there was for now no connection with the bombings on March 22 at Brussels airport and a metro station near the European Union headquarters that left 32 people dead.
No weapons or explosives were found in Friday's raids ordered by a judge specialising in counter-terror cases, the prosecutor's office said.