diff --git a/formidable/accesses.py b/formidable/accesses.py
index fcbdfacc..77e04fb6 100644
--- a/formidable/accesses.py
+++ b/formidable/accesses.py
@@ -13,10 +13,6 @@
 import six
 
 
-class AccessUnknow(Exception):
-    pass
-
-
 class AccessObject(object):
     def __init__(self, id, label, description=''):
         self.id = id
diff --git a/formidable/exceptions.py b/formidable/exceptions.py
new file mode 100644
index 00000000..c6c15e65
--- /dev/null
+++ b/formidable/exceptions.py
@@ -0,0 +1,7 @@
+
+class UnknownAccess(Exception):
+    """
+    Access doesn't exist for this user.
+
+    """
+    pass
diff --git a/formidable/forms/fields.py b/formidable/forms/fields.py
index e9d77b28..a1a93f91 100644
--- a/formidable/forms/fields.py
+++ b/formidable/forms/fields.py
@@ -53,8 +53,9 @@
 
 from django.forms import fields
 
-from formidable.accesses import AccessUnknow, get_accesses
+from formidable.accesses import get_accesses
 from formidable.constants import EDITABLE
+from formidable.exceptions import UnknownAccess
 from formidable.forms import boundfield, widgets
 
 
@@ -116,7 +117,7 @@ def check_accesses(self):
         accesses_id = [access.id for access in get_accesses()]
         for access in self.accesses.keys():
             if access not in accesses_id:
-                raise AccessUnknow(access)
+                raise UnknownAccess(access)
 
     def get_widget(self):
         return self.widget