diff --git a/app/api/partitions.py b/app/api/partitions.py
index 4d752b65..f854af38 100644
--- a/app/api/partitions.py
+++ b/app/api/partitions.py
@@ -12,6 +12,7 @@ from operator import attrgetter
 from flask import g, request
 from flask_json import as_json
 from flask_login import login_required
+import sqlalchemy as sa
 from sqlalchemy.exc import IntegrityError
 
 import app
@@ -248,19 +249,25 @@ def partition_remove_etud(partition_id: int, etudid: int):
     partition = query.first_or_404()
     if not partition.formsemestre.etat:
         return json_error(403, "formsemestre verrouillé")
-    groups = (
-        GroupDescr.query.filter_by(partition_id=partition_id)
-        .join(group_membership)
-        .filter_by(etudid=etudid)
+
+    db.session.execute(
+        sa.text(
+            """DELETE FROM group_membership
+        WHERE etudid=:etudid
+        and group_id IN (
+            SELECT id FROM group_descr WHERE partition_id = :partition_id
+        );
+        """
+        ),
+        {"etudid": etudid, "partition_id": partition_id},
+    )
+
+    Scolog.logdb(
+        method="partition_remove_etud",
+        etudid=etud.id,
+        msg=f"Retrait de la partition {partition.partition_name}",
+        commit=False,
     )
-    for group in groups:
-        group.etuds.remove(etud)
-        Scolog.logdb(
-            method="partition_remove_etud",
-            etudid=etud.id,
-            msg=f"Retrait du groupe {group.group_name} de {group.partition.partition_name}",
-            commit=True,
-        )
     db.session.commit()
     # Update parcours
     partition.formsemestre.update_inscriptions_parcours_from_groups()