diff --git a/bda/models.py b/bda/models.py
index a405a665..df73a209 100644
--- a/bda/models.py
+++ b/bda/models.py
@@ -315,10 +315,11 @@ class SpectacleRevente(models.Model):
             # Envoie un mail aux perdants
             for inscrit in inscrits:
                 if inscrit != winner:
-                    context['acheteur'] = inscrit.user
+                    new_context = dict(context)
+                    new_context['acheteur'] = inscrit.user
                     datatuple.append((
                         'bda-revente-loser',
-                        context,
+                        new_context,
                         settings.MAIL_DATA['revente']['FROM'],
                         [inscrit.user.email]
                     ))