diff --git a/heat/engine/resources/openstack/neutron/port.py b/heat/engine/resources/openstack/neutron/port.py
index 411cdb4687..48253e5c05 100644
--- a/heat/engine/resources/openstack/neutron/port.py
+++ b/heat/engine/resources/openstack/neutron/port.py
@@ -261,6 +261,12 @@ class Port(neutron.NeutronResource):
         ),
     }
 
+    # Need to update properties_schema with other properties before
+    # initialisation, because resource should contain all properties before
+    # creating. Also, documentation should correctly resolves resource
+    # properties schema.
+    properties_schema.update(extra_properties_schema)
+
     attributes_schema = {
         ADMIN_STATE_UP_ATTR: attributes.Schema(
             _("The administrative state of this port."),
@@ -323,11 +329,6 @@ class Port(neutron.NeutronResource):
         ),
     }
 
-    def __init__(self, name, definition, stack):
-        """Overloaded init in case of merging two schemas to one."""
-        self.properties_schema.update(self.extra_properties_schema)
-        super(Port, self).__init__(name, definition, stack)
-
     def translation_rules(self, props):
         return [
             translation.TranslationRule(