diff --git a/gns3server/api/routes/controller/links.py b/gns3server/api/routes/controller/links.py
index 5a51905e0..9e33b7ba3 100644
--- a/gns3server/api/routes/controller/links.py
+++ b/gns3server/api/routes/controller/links.py
@@ -458,6 +458,8 @@ async def create_marker(
     # uuid suffix avoids the collision that `marker-{link.id[:8]}` alone would
     # cause on the second anonymous marker on the same link (start_marker
     # rejects duplicate names).
+    if marker_data.name and marker_data.name.lower().startswith("global"):
+        raise ControllerError('Names starting with "global" are reserved for inherited markers')
     name = marker_data.name or f"marker-{link.id[:8]}-{uuid4().hex[:4]}"
     await link.start_marker(
         name=name,
diff --git a/gns3server/api/routes/controller/projects.py b/gns3server/api/routes/controller/projects.py
index 103c7d310..5e6f1c6de 100644
--- a/gns3server/api/routes/controller/projects.py
+++ b/gns3server/api/routes/controller/projects.py
@@ -260,6 +260,8 @@ async def create_marker_definition(
     Required privilege: Project.Modify
     """
 
+    if def_data.name and def_data.name.lower().startswith("global"):
+        raise ControllerError('Names starting with "global" are reserved for inherited markers')
     name = def_data.name or f"def-{project.id[:8]}"
     await project.create_marker_definition(
         name=name,
diff --git a/gns3server/schemas/controller/links.py b/gns3server/schemas/controller/links.py
index 82bfc48b9..23a0cd18a 100644
--- a/gns3server/schemas/controller/links.py
+++ b/gns3server/schemas/controller/links.py
@@ -14,7 +14,7 @@
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-from pydantic import BaseModel, Field, field_validator
+from pydantic import BaseModel, Field
 from typing import List, Optional, Tuple
 from enum import Enum
 from uuid import UUID, uuid4
@@ -176,13 +176,6 @@ class MarkerCreate(BaseModel):
         description="Whether the marker is active. Defaults to true on creation.",
     )
 
-    @field_validator("name")
-    @classmethod
-    def _check_name_not_reserved(cls, v):
-        if v is not None and v.lower().startswith("global"):
-            raise ValueError('Names starting with "global" are reserved')
-        return v
-
 
 class MarkerDefinitionCreate(BaseModel):
     """
@@ -215,11 +208,4 @@ class MarkerDefinitionCreate(BaseModel):
         ),
     )
 
-    @field_validator("name")
-    @classmethod
-    def _check_name_not_reserved(cls, v):
-        if v is not None and v.lower().startswith("global"):
-            raise ValueError('Names starting with "global" are reserved')
-        return v
-