diff --git a/neutron_lib/callbacks/resources.py b/neutron_lib/callbacks/resources.py
index 73667a598..c91d9e3e6 100644
--- a/neutron_lib/callbacks/resources.py
+++ b/neutron_lib/callbacks/resources.py
@@ -28,5 +28,4 @@ SEGMENT = 'segment'
 SEGMENT_HOST_MAPPING = 'segment_host_mapping'
 SUBNET = 'subnet'
 SUBNETS = 'subnets'
-SUBNET_GATEWAY = 'subnet_gateway'
 SUBNETPOOL_ADDRESS_SCOPE = 'subnetpool_address_scope'