diff --git a/moto/ec2/models.py b/moto/ec2/models.py
index f800097d2..efe968eb2 100644
--- a/moto/ec2/models.py
+++ b/moto/ec2/models.py
@@ -173,7 +173,7 @@ class NetworkInterface(object):
                 group = self.ec2_backend.get_security_group_from_id(group_id)
                 if not group:
                     # Create with specific group ID.
-                    group = SecurityGroup(group.ec2_backend, group_id, group_id, group_id, vpc_id=subnet.vpc_id)
+                    group = SecurityGroup(self.ec2_backend, group_id, group_id, group_id, vpc_id=subnet.vpc_id)
                     self.ec2_backend.groups[subnet.vpc_id][group_id] = group
                 if group:
                     self._group_set.append(group)