diff --git a/manifests/plugins/ml2.pp b/manifests/plugins/ml2.pp
index a174b2335..2b25d13bf 100644
--- a/manifests/plugins/ml2.pp
+++ b/manifests/plugins/ml2.pp
@@ -106,7 +106,7 @@
 #   (optional) For L3 mechanism drivers, determines the maximum permissible
 #   size of an unfragmented packet travelling from and to addresses where
 #   encapsulated traffic is sent.
-#   Defaults to 0.
+#   Defaults to $facts['os_service_default'].
 #
 # [*purge_config*]
 #   (optional) Whether to set only the specified config options
@@ -136,7 +136,7 @@ class neutron::plugins::ml2 (
   $enable_security_group     = $facts['os_service_default'],
   $package_ensure            = 'present',
   $physical_network_mtus     = $facts['os_service_default'],
-  $path_mtu                  = 0,
+  $path_mtu                  = $facts['os_service_default'],
   Boolean $purge_config      = false,
   $max_header_size           = $facts['os_service_default'],
   $overlay_ip_version        = $facts['os_service_default'],
diff --git a/spec/classes/neutron_plugins_ml2_spec.rb b/spec/classes/neutron_plugins_ml2_spec.rb
index f6d3d4ee7..64d0d9227 100644
--- a/spec/classes/neutron_plugins_ml2_spec.rb
+++ b/spec/classes/neutron_plugins_ml2_spec.rb
@@ -37,7 +37,6 @@ describe 'neutron::plugins::ml2' do
       :tunnel_id_ranges      => '20:100',
       :vxlan_group           => '224.0.0.1',
       :vni_ranges            => '10:100',
-      :path_mtu              => '0',
       :package_ensure        => 'present',
       :purge_config          => false,
     }
@@ -69,7 +68,7 @@ describe 'neutron::plugins::ml2' do
       should contain_neutron_plugin_ml2('ml2/tenant_network_types').with_value(p[:tenant_network_types].join(','))
       should contain_neutron_plugin_ml2('ml2/mechanism_drivers').with_value(p[:mechanism_drivers].join(','))
       should contain_neutron_plugin_ml2('ml2/extension_drivers').with_value('<SERVICE DEFAULT>')
-      should contain_neutron_plugin_ml2('ml2/path_mtu').with_value(p[:path_mtu])
+      should contain_neutron_plugin_ml2('ml2/path_mtu').with_value('<SERVICE DEFAULT>')
       should contain_neutron_plugin_ml2('ml2/physical_network_mtus').with_value('<SERVICE DEFAULT>')
       should contain_neutron_plugin_ml2('ml2/overlay_ip_version').with_value('<SERVICE DEFAULT>')
       should contain_neutron_plugin_ml2('securitygroup/enable_security_group').with_value('<SERVICE DEFAULT>')