diff --git a/oidc_provider/lib/claims.py b/oidc_provider/lib/claims.py
index d4398c0..6c80bc8 100644
--- a/oidc_provider/lib/claims.py
+++ b/oidc_provider/lib/claims.py
@@ -1,3 +1,5 @@
+import copy
+
 from django.utils.translation import ugettext as _
 
 from oidc_provider import settings
@@ -16,7 +18,8 @@ class ScopeClaims(object):
 
     def __init__(self, token):
         self.user = token.user
-        self.userinfo = settings.get('OIDC_USERINFO', import_str=True)(STANDARD_CLAIMS, self.user)
+        claims = copy.deepcopy(STANDARD_CLAIMS)
+        self.userinfo = settings.get('OIDC_USERINFO', import_str=True)(claims, self.user)
         self.scopes = token.scope
         self.client = token.client