diff --git a/gestion/ldap_crans.py b/gestion/ldap_crans.py
index 65c61428..f18b5f99 100755
--- a/gestion/ldap_crans.py
+++ b/gestion/ldap_crans.py
@@ -4223,6 +4223,8 @@ class Facture(BaseClasseCrans):
 
     def delete(self, comment=''):
         """Suppression de la facture"""
+        if self.controle():
+            raise EnvironmentError(u"La facture a déjà été controlée")
         self.__proprietaire = None
         self._delete(self.dn, comment)