diff --git a/nova/api/openstack/compute/block_device_mapping.py b/nova/api/openstack/compute/block_device_mapping.py
index 4487bd7bb9..57fa73ee3d 100644
--- a/nova/api/openstack/compute/block_device_mapping.py
+++ b/nova/api/openstack/compute/block_device_mapping.py
@@ -20,30 +20,14 @@ from webob import exc
 from nova.api.openstack import api_version_request
 from nova.api.openstack.compute.schemas import block_device_mapping as \
                                                   schema_block_device_mapping
-from nova.api.openstack import extensions
 from nova import block_device
 from nova import exception
 from nova.i18n import _
 
-ALIAS = "os-block-device-mapping"
 ATTRIBUTE_NAME = "block_device_mapping_v2"
 LEGACY_ATTRIBUTE_NAME = "block_device_mapping"
 
 
-class BlockDeviceMapping(extensions.V21APIExtensionBase):
-    """Block device mapping boot support."""
-
-    name = "BlockDeviceMapping"
-    alias = ALIAS
-    version = 1
-
-    def get_resources(self):
-        return []
-
-    def get_controller_extensions(self):
-        return []
-
-
 # use nova.api.extensions.server.extensions entry point to modify
 # server create kwargs
 # NOTE(gmann): This function is not supposed to use 'body_deprecated_param'
diff --git a/setup.cfg b/setup.cfg
index 7f20c96176..6a7854bb7b 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -73,7 +73,6 @@ wsgi_scripts =
 
 nova.api.v21.extensions =
     baremetal_nodes = nova.api.openstack.compute.baremetal_nodes:BareMetalNodes
-    block_device_mapping = nova.api.openstack.compute.block_device_mapping:BlockDeviceMapping
     cells = nova.api.openstack.compute.cells:Cells
     cloudpipe = nova.api.openstack.compute.cloudpipe:Cloudpipe
     extension_info = nova.api.openstack.compute.extension_info:ExtensionInfo