diff --git a/libfic/file.go b/libfic/file.go
index 472b9e3f..59d150f1 100644
--- a/libfic/file.go
+++ b/libfic/file.go
@@ -246,7 +246,9 @@ func (f EFile) Delete() (int64, error) {
 
 // WipeFiles deletes (only in the database, not on disk) files coming with the challenge.
 func (e Exercice) WipeFiles() (int64, error) {
-	if res, err := DBExec("DELETE FROM exercice_files WHERE id_exercice = ?", e.Id); err != nil {
+	if _, err := DBExec("DELETE FROM exercice_files_deps WHERE id_flag IN (SELECT id_flag FROM exercice_flags WHERE id_exercice = ?)", e.Id); err != nil {
+		return 0, err
+	} else if res, err := DBExec("DELETE FROM exercice_files WHERE id_exercice = ?", e.Id); err != nil {
 		return 0, err
 	} else if nb, err := res.RowsAffected(); err != nil {
 		return 0, err