diff --git a/src/authentic2_cut/apps.py b/src/authentic2_cut/apps.py
index 22ac619..795ca7c 100644
--- a/src/authentic2_cut/apps.py
+++ b/src/authentic2_cut/apps.py
@@ -116,7 +116,7 @@ class AppConfig(django.apps.AppConfig):
                     del form.fields['creation_domain']
                     del form.fields['validation_partner']
                 else:
-                    for field_name in form.fields:
+                    for field_name in list(form.fields):
                         if field_name not in ['username',
                                               'first_name',
                                               'last_name',
@@ -144,7 +144,7 @@ class AppConfig(django.apps.AppConfig):
                         del form.fields[field_name]
                 form.fields['comment'].widget = Textarea(attrs={'rows': 4})
             else:
-                for field_name in form.fields:
+                for field_name in list(form.fields):
                     if field_name not in ['username',
                                           'first_name',
                                           'last_name',
@@ -167,7 +167,7 @@ class AppConfig(django.apps.AppConfig):
 
             # Si un compte est validé, on interdit la modification des attributs coeurs
             if form.instance.attributes.validated:
-                for field_name in form.fields:
+                for field_name in list(form.fields):
                     if field_name in ['first_name',
                                       'last_name',
                                       'birthcountry_insee',
@@ -208,7 +208,7 @@ class AppConfig(django.apps.AppConfig):
                             del form.fields[field_name]
                     form.fields['comment'].widget = Textarea(attrs={'readonly': '', 'rows': 4})
                 else:
-                    for field_name in form.fields:
+                    for field_name in list(form.fields):
                         if field_name not in ['username', 'first_name', 'last_name', 'email']:
                             del form.fields[field_name]