diff --git a/codegenerator/openapi/neutron.py b/codegenerator/openapi/neutron.py
index 204e3a4..b7727a4 100644
--- a/codegenerator/openapi/neutron.py
+++ b/codegenerator/openapi/neutron.py
@@ -1039,7 +1039,7 @@ class NeutronGenerator(OpenStackServerSourceBase):
                                     "description": "The ID of the attached network.",
                                 },
                                 "admin_state_up": {
-                                    "type": ["string", "boolean"],
+                                    "type": "boolean",
                                     "description": "The administrative state of the resource, which is up (`true`) or down (`false`).",
                                 },
                                 "mac_address": {