diff --git a/oidc_provider/lib/claims.py b/oidc_provider/lib/claims.py
index 28c4602..32c7b27 100644
--- a/oidc_provider/lib/claims.py
+++ b/oidc_provider/lib/claims.py
@@ -68,7 +68,7 @@ class ScopeClaims(object):
         """
         scopes = []
 
-        for name in self.__class__.__dict__:
+        for name in dir(self.__class__):
             if name.startswith('scope_'):
                 scope = name.split('scope_')[1]
                 scopes.append(scope)
@@ -98,7 +98,7 @@ class ScopeClaims(object):
             scopes = []
         scopes_info = []
 
-        for name in cls.__dict__:
+        for name in dir(cls):
             if name.startswith('info_'):
                 scope_name = name.split('info_')[1]
                 if scope_name in scopes:
diff --git a/oidc_provider/tests/cases/test_claims.py b/oidc_provider/tests/cases/test_claims.py
index c1ac794..4c274dc 100644
--- a/oidc_provider/tests/cases/test_claims.py
+++ b/oidc_provider/tests/cases/test_claims.py
@@ -12,7 +12,7 @@ class ClaimsTestCase(TestCase):
 
     def setUp(self):
         self.user = create_fake_user()
-        self.scopes = ['openid', 'address', 'email', 'phone', 'profile']
+        self.scopes = ['openid', 'address', 'email', 'phone', 'profile', 'foo']
         self.client = create_fake_client('code')
         self.token = create_fake_token(self.user, self.scopes, self.client)
         self.scopeClaims = ScopeClaims(self.token)
@@ -62,3 +62,25 @@ class ClaimsTestCase(TestCase):
     def test_locale(self):
         with override_language('fr'):
             self.assertEqual(text_type(StandardScopeClaims.info_profile[0]), 'Profil de base')
+
+    def test_scopeclaims_class_inheritance(self):
+        # Generate example class that will be used for `OIDC_EXTRA_SCOPE_CLAIMS` setting.
+        class CustomScopeClaims(ScopeClaims):
+
+            info_foo = ('Title', 'Description')
+
+            def scope_foo(self):
+                dic = {'test': self.user.id}
+                return dic
+
+            info_notadd = ('Title', 'Description')
+
+            def scope_notadd(self):
+                dic = {'test': self.user.id}
+                return dic
+
+        claims = CustomScopeClaims(self.token)
+        response = claims.create_response_dic()
+
+        self.assertTrue('test' in response.keys())
+        self.assertFalse('notadd' in response.keys())