diff --git a/quantum/db/securitygroups_db.py b/quantum/db/securitygroups_db.py
index 7eba36cf53..5295630608 100644
--- a/quantum/db/securitygroups_db.py
+++ b/quantum/db/securitygroups_db.py
@@ -398,11 +398,11 @@ class SecurityGroupDbMixin(ext_sg.SecurityGroupPluginBase):
             raise ext_sg.SecurityGroupRuleNotFound(id=id)
         return sgr
 
-    def delete_security_group_rule(self, context, sgrid):
+    def delete_security_group_rule(self, context, id):
         if (cfg.CONF.SECURITYGROUP.proxy_mode and not context.is_admin):
             raise ext_sg.SecurityGroupProxyModeNotAdmin()
         with context.session.begin(subtransactions=True):
-            rule = self._get_security_group_rule(context, sgrid)
+            rule = self._get_security_group_rule(context, id)
             context.session.delete(rule)
 
     def _extend_port_dict_security_group(self, context, port):
diff --git a/quantum/extensions/securitygroup.py b/quantum/extensions/securitygroup.py
index 756c0753c2..8dd342e4cd 100644
--- a/quantum/extensions/securitygroup.py
+++ b/quantum/extensions/securitygroup.py
@@ -15,6 +15,7 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from abc import ABCMeta
 from abc import abstractmethod
 
 from quantum.api import extensions
@@ -315,16 +316,14 @@ class Securitygroup(extensions.ExtensionDescriptor):
 
 
 class SecurityGroupPluginBase(object):
+    __metaclass__ = ABCMeta
+
     @abstractmethod
     def create_security_group(self, context, security_group):
         pass
 
     @abstractmethod
-    def delete_security_group(self, context, security_group):
-        pass
-
-    @abstractmethod
-    def update_security_group(self, context, security_group):
+    def delete_security_group(self, context, id):
         pass
 
     @abstractmethod
@@ -340,7 +339,7 @@ class SecurityGroupPluginBase(object):
         pass
 
     @abstractmethod
-    def delete_security_group_rule(self, context, sgrid):
+    def delete_security_group_rule(self, context, id):
         pass
 
     @abstractmethod