diff --git a/authens/models.py b/authens/models.py
index a1cbd25..b68b7d0 100644
--- a/authens/models.py
+++ b/authens/models.py
@@ -30,6 +30,9 @@ class CASAccount(models.Model):
         verbose_name=_("année de création du compte CAS"), blank=False, null=False
     )
 
+    # The entrance year 0 is used for members of staff
+    STAFF_ENTRANCE_YEAR = 0
+
     class Meta:
         verbose_name = _("Compte CAS")
         verbose_name_plural = _("Comptes CAS")
diff --git a/authens/utils.py b/authens/utils.py
index 733cf10..7306506 100644
--- a/authens/utils.py
+++ b/authens/utils.py
@@ -6,6 +6,7 @@ from cas import CASClient
 from django.conf import settings
 
 from authens import conf as default_conf
+from authens.models import CASAccount
 
 
 def get_cas_client(request):
@@ -35,9 +36,8 @@ def parse_entrance_year(home_dir):
         settings, "AUTHENS_ALLOW_STAFF", default_conf.AUTHENS_ALLOW_STAFF
     )
 
-    # The staff members have an entrance year set to 0
     if allow_staff and dirs[:3] == ["", "users", "staffs"]:
-        return 0
+        return CASAccount.STAFF_ENTRANCE_YEAR
 
     if len(dirs) < 3 or not dirs[2].isdecimal() or dirs[1] != "users":
         raise ValueError("Invalid home directory: {}".format(home_dir))