diff --git a/devstack/plugin.sh b/devstack/plugin.sh
index 1216277daef..fe175314863 100644
--- a/devstack/plugin.sh
+++ b/devstack/plugin.sh
@@ -1,12 +1,5 @@
 LIBDIR=$DEST/neutron/devstack/lib
 
-if is_neutron_legacy_enabled; then
-    NEUTRON_CORE_PLUGIN=$Q_PLUGIN
-    NEUTRON_AGENT=$Q_AGENT
-    NEUTRON_CORE_PLUGIN_CONF_PATH=$Q_PLUGIN_CONF_PATH
-    NEUTRON_CORE_PLUGIN_CONF=$Q_PLUGIN_CONF_FILE
-fi
-
 source $LIBDIR/dns
 source $LIBDIR/flavors
 source $LIBDIR/l2_agent
diff --git a/devstack/settings b/devstack/settings
index b452f883145..88531f1e4df 100644
--- a/devstack/settings
+++ b/devstack/settings
@@ -1 +1,10 @@
 L2_AGENT_EXTENSIONS=${L2_AGENT_EXTENSIONS:-}
+
+if is_neutron_legacy_enabled; then
+    NEUTRON_CORE_PLUGIN=$Q_PLUGIN
+    NEUTRON_AGENT=$Q_AGENT
+    # NOTE(ihrachys) those values are defined same way as in
+    # lib/neutron_plugins/ml2:neutron_plugin_configure_common
+    NEUTRON_CORE_PLUGIN_CONF_PATH=etc/neutron/plugins/ml2
+    NEUTRON_CORE_PLUGIN_CONF=$NEUTRON_CORE_PLUGIN_CONF_PATH/ml2_conf.ini
+fi