diff --git a/neutron/extensions/securitygroup.py b/neutron/extensions/securitygroup.py
index 3524117ee9e..cdbe29dcdec 100644
--- a/neutron/extensions/securitygroup.py
+++ b/neutron/extensions/securitygroup.py
@@ -174,7 +174,7 @@ def convert_ip_prefix_to_cidr(ip_prefix):
 
 
 def _validate_name_not_default(data, valid_values=None):
-    if data == "default":
+    if data.lower() == "default":
         raise SecurityGroupDefaultAlreadyExists()
 
 
diff --git a/neutron/tests/unit/test_extension_security_group.py b/neutron/tests/unit/test_extension_security_group.py
index e0061940b03..17484b965b8 100644
--- a/neutron/tests/unit/test_extension_security_group.py
+++ b/neutron/tests/unit/test_extension_security_group.py
@@ -332,6 +332,13 @@ class TestSecurityGroups(SecurityGroupDBTestCase):
         self.deserialize(self.fmt, res)
         self.assertEqual(res.status_int, webob.exc.HTTPConflict.code)
 
+    def test_create_default_security_group_check_case_insensitive(self):
+        name = 'DEFAULT'
+        description = 'my webservers'
+        res = self._create_security_group(self.fmt, name, description)
+        self.deserialize(self.fmt, res)
+        self.assertEqual(res.status_int, webob.exc.HTTPConflict.code)
+
     def test_list_security_groups(self):
         with contextlib.nested(self.security_group(name='sg1',
                                                    description='sg'),