diff --git a/tools/migrate_abs_to_assiduites.py b/tools/migrate_abs_to_assiduites.py
index 61bf1b97f2..278873e9be 100644
--- a/tools/migrate_abs_to_assiduites.py
+++ b/tools/migrate_abs_to_assiduites.py
@@ -331,11 +331,6 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
 
     db.session.commit()
 
-    justifs: Justificatif = Justificatif.query
-
-    if dept_name is not None:
-        justifs.filter(Justificatif.etudid.in_(etuds_id))
-
     print_progress_bar(
         absences_len,
         absences_len,
@@ -350,6 +345,7 @@ def migrate_dept(dept_name: str, stats: _Statistics, time_elapsed: Profiler):
         + TerminalColor.RESET
     )
 
+    justifs: Justificatif = Justificatif.query.join(Identite).filter_by(dept_id=dept.id)
     compute_assiduites_justified(justifs, reset=True)
 
     time_elapsed.stop()