diff --git a/vmware_nsx/db/extended_security_group.py b/vmware_nsx/db/extended_security_group.py
index f6d9ae3ba6..2885863d08 100644
--- a/vmware_nsx/db/extended_security_group.py
+++ b/vmware_nsx/db/extended_security_group.py
@@ -55,7 +55,7 @@ class NsxExtendedSecurityGroupProperties(model_base.BASEV2):
                          nullable=False)
     policy = sa.Column(sa.String(36))
     security_group = orm.relationship(
-        'neutron.db.models.securitygroup.SecurityGroup',
+        securitygroups_db.SecurityGroup,
         backref=orm.backref('ext_properties', lazy='joined',
                             uselist=False, cascade='delete'))
 
diff --git a/vmware_nsx/db/extended_security_group_rule.py b/vmware_nsx/db/extended_security_group_rule.py
index 1b8d8b45fd..fc39dd209e 100644
--- a/vmware_nsx/db/extended_security_group_rule.py
+++ b/vmware_nsx/db/extended_security_group_rule.py
@@ -19,6 +19,7 @@ from sqlalchemy import orm
 
 from neutron.db import _resource_extend as resource_extend
 from neutron.db import api as db_api
+from neutron.db.models import securitygroup
 from neutron.extensions import securitygroup as ext_sg
 from neutron_lib.api import validators
 from neutron_lib import exceptions as nexception
@@ -46,7 +47,7 @@ class NsxExtendedSecurityGroupRuleProperties(model_base.BASEV2):
     local_ip_prefix = sa.Column(sa.String(255), nullable=False)
 
     rule = orm.relationship(
-        'neutron.db.models.securitygroup.SecurityGroupRule',
+        securitygroup.SecurityGroupRule,
         backref=orm.backref('ext_properties', lazy='joined',
                             uselist=False, cascade='delete'))
 
diff --git a/vmware_nsx/db/nsx_models.py b/vmware_nsx/db/nsx_models.py
index 8b422bc9db..82e7aacb66 100644
--- a/vmware_nsx/db/nsx_models.py
+++ b/vmware_nsx/db/nsx_models.py
@@ -261,7 +261,7 @@ class MacLearningState(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Port model using the backref attribute.
     # This will instruct SQLAlchemy to eagerly load this association.
     port = orm.relationship(
-        'neutron.db.models_v2.Port',
+        models_v2.Port,
         backref=orm.backref("mac_learning_state", lazy='joined',
                             uselist=False, cascade='delete'))
 
@@ -318,7 +318,7 @@ class PortQueueMapping(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Port model adding a backref which will
     # allow SQLAlchemy for eagerly load the queue binding
     port = orm.relationship(
-        'neutron.db.models_v2.Port',
+        models_v2.Port,
         backref=orm.backref("qos_queue", uselist=False,
                             cascade='delete', lazy='joined'))
 
@@ -334,7 +334,7 @@ class NetworkQueueMapping(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Network model adding a backref which will
     # allow SQLAlcremy for eagerly load the queue binding
     network = orm.relationship(
-        'neutron.db.models_v2.Network',
+        models_v2.Network,
         backref=orm.backref("qos_queue", uselist=False,
                             cascade='delete', lazy='joined'))
 
diff --git a/vmware_nsx/db/nsxv_models.py b/vmware_nsx/db/nsxv_models.py
index ff7df3e792..9b5ae70a14 100644
--- a/vmware_nsx/db/nsxv_models.py
+++ b/vmware_nsx/db/nsxv_models.py
@@ -19,6 +19,8 @@ from neutron_lib.db import model_base
 import sqlalchemy as sa
 from sqlalchemy import orm
 
+from neutron.db.models import l3 as l3_db
+from neutron.db import models_v2
 from oslo_db.sqlalchemy import models
 
 from vmware_nsx.common import nsxv_constants
@@ -162,7 +164,7 @@ class NsxvRouterExtAttributes(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Router model in order to instruct
     # SQLAlchemy to eagerly load this association
     router = orm.relationship(
-        'neutron.db.models.l3.Router',
+        l3_db.Router,
         backref=orm.backref("nsx_attributes", lazy='joined',
                             uselist=False, cascade='delete'))
 
@@ -216,7 +218,7 @@ class NsxvPortIndexMapping(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Port model in order to instruct SQLAlchemy to
     # eagerly read port vnic-index
     port = orm.relationship(
-        'neutron.db.models_v2.Port',
+        models_v2.Port,
         backref=orm.backref("vnic_index", lazy='joined',
                             uselist=False, cascade='delete'))
 
@@ -342,7 +344,7 @@ class NsxvSubnetExtAttributes(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the Subnet model in order to instruct
     # SQLAlchemy to eagerly load this association
     subnet = orm.relationship(
-        'neutron.db.models_v2.Subnet',
+        models_v2.Subnet,
         backref=orm.backref("nsxv_subnet_attributes", lazy='joined',
                             uselist=False, cascade='delete'))
 
@@ -361,7 +363,7 @@ class NsxvPortExtAttributes(model_base.BASEV2, models.TimestampMixin):
     # Add a relationship to the port model in order to instruct
     # SQLAlchemy to eagerly load this association
     port = orm.relationship(
-        'neutron.db.models_v2.Port',
+        models_v2.Port,
         backref=orm.backref("nsx_port_attributes", lazy='joined',
                             uselist=False, cascade='delete'))