diff --git a/django/sp_sso/saml/forms.py b/django/sp_sso/saml/forms.py
index 628e16d..2254861 100644
--- a/django/sp_sso/saml/forms.py
+++ b/django/sp_sso/saml/forms.py
@@ -24,6 +24,7 @@ AFFECTATION_CHOICES = (
 )
 
 EMP_CORPS_CHOICES = (
+('', _('Unspecified status')),
 ('{NCORPS}056', "ADJ. ADM DE L'EN ET DE L'ENS SUP"),
 ('{NCORPS}837', 'ADJOINT TECHNIQUE DE RECH.ET FORMATION'),
 ('{NCORPS}839', 'ADJOINT TECHNIQUE-RECHERCHE & FORMATION'),
@@ -163,7 +164,7 @@ class RegistrationForm(forms.Form):
         required=False, max_length=100, label=_("Assignment units"))
     # supannEmpCorps
     s_emp_corps = forms.ChoiceField(
-        choices=EMP_CORPS_CHOICES, label=_("Source entity"))
+        choices=EMP_CORPS_CHOICES, required=False, label=_("Source entity"))
     # supannListeRouge
     s_liste_rouge = forms.BooleanField(
         initial=True, required=False, label=_("Unlist contact information"))