diff --git a/app/api/partitions.py b/app/api/partitions.py
index fcb6013c6..6b366ec54 100644
--- a/app/api/partitions.py
+++ b/app/api/partitions.py
@@ -417,7 +417,7 @@ def formsemestre_order_partitions(formsemestre_id: int):
     db.session.commit()
     app.set_sco_dept(formsemestre.departement.acronym)
     sco_cache.invalidate_formsemestre(formsemestre_id)
-    return jsonify(formsemestre.to_dict())
+    return jsonify(formsemestre.to_dict(convert_objects=True))
 
 
 @bp.route("/partition/<int:partition_id>/groups/order", methods=["POST"])