diff --git a/app/api/partitions.py b/app/api/partitions.py
index abef92e8cf..a1229387b0 100644
--- a/app/api/partitions.py
+++ b/app/api/partitions.py
@@ -136,20 +136,22 @@ def etud_in_group(group_id: int):
 def etud_in_group_query(group_id: int):
     """Etudiants du groupe, filtrés par état"""
     etat = request.args.get("etat")
-    if etat not in {scu.INSCRIT, scu.DEMISSION, scu.DEF}:
+    if etat not in {None, scu.INSCRIT, scu.DEMISSION, scu.DEF}:
         return json_error(404, "etat: valeur invalide")
     query = GroupDescr.query.filter_by(id=group_id)
     if g.scodoc_dept:
         query = (
             query.join(Partition).join(FormSemestre).filter_by(dept_id=g.scodoc_dept_id)
         )
-    group = query.first_or_404()  # just tro ckeck that group exists in accessible dept
-    query = (
-        Identite.query.join(FormSemestreInscription)
-        .filter_by(formsemestre_id=group.partition.formsemestre_id, etat=etat)
-        .join(group_membership)
-        .filter_by(group_id=group_id)
+    group = query.first_or_404()  # just to ckeck that group exists in accessible dept
+
+    query = Identite.query.join(FormSemestreInscription).filter_by(
+        formsemestre_id=group.partition.formsemestre_id
     )
+    if etat is not None:
+        query = query.filter_by(etat=etat)
+
+    query = query.join(group_membership).filter_by(group_id=group_id)
 
     return jsonify([etud.to_dict_short() for etud in query])
 
diff --git a/tests/api/test_api_partitions.py b/tests/api/test_api_partitions.py
index f3999db85c..d1138a576c 100644
--- a/tests/api/test_api_partitions.py
+++ b/tests/api/test_api_partitions.py
@@ -134,10 +134,10 @@ def test_etud_in_group(api_headers):
         - /group/<int:group_id>/etudiants/query?etat=<string:etat>
     """
     group_id = 1
-    etudiants = GET(f"/group/{group_id}/etudiants", headers=api_headers)
-    assert isinstance(etudiants, list)
+    etuds = GET(f"/group/{group_id}/etudiants", headers=api_headers)
+    assert isinstance(etuds, list)
 
-    for etud in etudiants:
+    for etud in etuds:
         assert verify_fields(etud, PARTITION_GROUPS_ETUD_FIELDS)
         assert isinstance(etud["id"], int)
         assert isinstance(etud["dept_id"], int)
@@ -148,12 +148,14 @@ def test_etud_in_group(api_headers):
         assert isinstance(etud["code_nip"], str)
         assert isinstance(etud["code_ine"], str)
 
+    # query sans filtre:
+    etuds_query = GET(f"/group/{group_id}/etudiants/query", headers=api_headers)
+    assert etuds_query == etuds
+
     etat = "I"
-    etudiants = GET(
-        f"/group/{group_id}/etudiants/query?etat={etat}", headers=api_headers
-    )
-    assert isinstance(etudiants, list)
-    for etud in etudiants:
+    etuds = GET(f"/group/{group_id}/etudiants/query?etat={etat}", headers=api_headers)
+    assert isinstance(etuds, list)
+    for etud in etuds:
         assert verify_fields(etud, PARTITION_GROUPS_ETUD_FIELDS)
         assert isinstance(etud["id"], int)
         assert isinstance(etud["dept_id"], int)