diff --git a/app/api/tools.py b/app/api/tools.py
index 7ed1a44e6..e1903f2db 100644
--- a/app/api/tools.py
+++ b/app/api/tools.py
@@ -15,7 +15,9 @@ from app.models import Departement, Identite, Admission
 from app.scodoc.sco_permissions import Permission
 
 
-def get_etud(etudid=None, nip=None, ine=None) -> models.Identite:
+def get_etud(
+    etudid: int | None = None, nip: str | None = None, ine: str | None = None
+) -> models.Identite:
     """
     L'instance d'étudiant la plus récente en fonction de l'etudid,
     ou du code nip ou code ine.
@@ -29,6 +31,13 @@ def get_etud(etudid=None, nip=None, ine=None) -> models.Identite:
     allowed_depts = current_user.get_depts_with_permission(Permission.ScoView)
 
     if etudid is not None:
+        try:
+            etudid = int(etudid)
+        except ValueError:
+            return json_error(
+                404,
+                message="etudid invalide",
+            )
         query: Identite = Identite.query.filter_by(id=etudid)
     elif nip is not None:
         query = Identite.query.filter_by(code_nip=nip)