diff --git a/nova/api/openstack/compute/schemas/block_device_mapping.py b/nova/api/openstack/compute/schemas/block_device_mapping.py
index 81097f936f60..1d9dfbc1d81f 100644
--- a/nova/api/openstack/compute/schemas/block_device_mapping.py
+++ b/nova/api/openstack/compute/schemas/block_device_mapping.py
@@ -15,7 +15,6 @@
 import copy
 
 from nova.api.openstack.compute.schemas import block_device_mapping_v1
-from nova.api.openstack.compute.schemas import server_tags
 from nova.api.validation import parameter_types
 from nova.objects import fields
 
@@ -74,7 +73,7 @@ server_create = {
 }
 
 block_device_mapping_v232_new_item = {
-    'tag': server_tags.tag
+    'tag': parameter_types.tag
 }
 
 block_device_mapping_v232 = copy.deepcopy(block_device_mapping)
diff --git a/nova/api/openstack/compute/schemas/server_tags.py b/nova/api/openstack/compute/schemas/server_tags.py
index a236a30547a8..c60484d68785 100644
--- a/nova/api/openstack/compute/schemas/server_tags.py
+++ b/nova/api/openstack/compute/schemas/server_tags.py
@@ -10,11 +10,6 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-tag = {
-    "type": "string",
-    "pattern": "^[^,/]*$"
-}
-
 update_all = {
     "definitions": {
         "tag": {
diff --git a/nova/api/openstack/compute/schemas/servers.py b/nova/api/openstack/compute/schemas/servers.py
index 585144b55980..7a9d13ef8f21 100644
--- a/nova/api/openstack/compute/schemas/servers.py
+++ b/nova/api/openstack/compute/schemas/servers.py
@@ -14,7 +14,6 @@
 
 import copy
 
-from nova.api.openstack.compute.schemas import server_tags
 from nova.api.validation import parameter_types
 
 
@@ -76,7 +75,7 @@ base_create_v219['properties']['server'][
 base_create_v232 = copy.deepcopy(base_create_v219)
 base_create_v232['properties']['server'][
     'properties']['networks']['items'][
-    'properties']['tag'] = server_tags.tag
+    'properties']['tag'] = parameter_types.tag
 
 
 # 2.37 builds on 2.32 and makes the following changes:
diff --git a/nova/api/openstack/compute/server_tags.py b/nova/api/openstack/compute/server_tags.py
index a229e7b26c43..de0bb844d466 100644
--- a/nova/api/openstack/compute/server_tags.py
+++ b/nova/api/openstack/compute/server_tags.py
@@ -19,6 +19,7 @@ from nova.api.openstack.compute.views import server_tags
 from nova.api.openstack import extensions
 from nova.api.openstack import wsgi
 from nova.api import validation
+from nova.api.validation import parameter_types
 from nova import compute
 from nova.compute import vm_states
 from nova import exception
@@ -91,7 +92,7 @@ class ServerTagsController(wsgi.Controller):
         self._check_instance_in_valid_state(context, server_id, 'update tag')
 
         try:
-            jsonschema.validate(id, schema.tag)
+            jsonschema.validate(id, parameter_types.tag)
         except jsonschema.ValidationError as e:
             msg = (_("Tag '%(tag)s' is invalid. It must be a string without "
                      "characters '/' and ','. Validation error message: "
@@ -141,7 +142,7 @@ class ServerTagsController(wsgi.Controller):
         invalid_tags = []
         for tag in body['tags']:
             try:
-                jsonschema.validate(tag, schema.tag)
+                jsonschema.validate(tag, parameter_types.tag)
             except jsonschema.ValidationError:
                 invalid_tags.append(tag)
         if invalid_tags:
diff --git a/nova/api/validation/parameter_types.py b/nova/api/validation/parameter_types.py
index c3e548709a91..352b956c08f4 100644
--- a/nova/api/validation/parameter_types.py
+++ b/nova/api/validation/parameter_types.py
@@ -395,3 +395,8 @@ personality = {
         'additionalProperties': False,
     }
 }
+
+tag = {
+    "type": "string",
+    "pattern": "^[^,/]*$"
+}