diff --git a/neutron/conf/common.py b/neutron/conf/common.py
index 68616fe78e1..4d408f11e0a 100644
--- a/neutron/conf/common.py
+++ b/neutron/conf/common.py
@@ -134,7 +134,6 @@ core_opts = [
                        'Filter validation is enabled if this config '
                        'is turned on and it is supported by all plugins')),
     cfg.IntOpt('global_physnet_mtu', default=constants.DEFAULT_NETWORK_MTU,
-               deprecated_name='segment_mtu', deprecated_group='ml2',
                help=_('MTU of the underlying physical network. Neutron uses '
                       'this value to calculate MTU for all virtual network '
                       'components. For flat and VLAN networks, neutron uses '
diff --git a/releasenotes/notes/remove-segment_mtu-4a78b8d47830fb8a.yaml b/releasenotes/notes/remove-segment_mtu-4a78b8d47830fb8a.yaml
new file mode 100644
index 00000000000..cb20cd2546d
--- /dev/null
+++ b/releasenotes/notes/remove-segment_mtu-4a78b8d47830fb8a.yaml
@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    The ``[DEFAULT] segment_mtu`` configuration option has been removed.
+    It was replaced by the ``[DEFAULT] global_physnet_mtu`` option
+    in the Mitaka release.