diff --git a/t4_devkit/schema/name.py b/t4_devkit/schema/name.py
index 29ce7f6..e310a8a 100644
--- a/t4_devkit/schema/name.py
+++ b/t4_devkit/schema/name.py
@@ -1,10 +1,11 @@
 from __future__ import annotations
 
-from enum import Enum
+from enum import Enum, unique
 
 __all__ = ("SchemaName",)
 
 
+@unique
 class SchemaName(str, Enum):
     """An enum to represent schema filenames.
 
diff --git a/t4_devkit/schema/tables/sample_data.py b/t4_devkit/schema/tables/sample_data.py
index adc2199..3139867 100644
--- a/t4_devkit/schema/tables/sample_data.py
+++ b/t4_devkit/schema/tables/sample_data.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from enum import Enum
+from enum import Enum, unique
 from typing import TYPE_CHECKING
 
 from attrs import define, field
@@ -15,6 +15,7 @@
 __all__ = ["SampleData", "FileFormat"]
 
 
+@unique
 class FileFormat(str, Enum):
     """An enum to represent file formats.
 
diff --git a/t4_devkit/schema/tables/sensor.py b/t4_devkit/schema/tables/sensor.py
index 8e684b9..4fc9b07 100644
--- a/t4_devkit/schema/tables/sensor.py
+++ b/t4_devkit/schema/tables/sensor.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from enum import Enum
+from enum import Enum, unique
 
 from attrs import define, field
 
@@ -11,6 +11,7 @@
 __all__ = ("Sensor", "SensorModality")
 
 
+@unique
 class SensorModality(str, Enum):
     """An enum to represent sensor modalities.
 
diff --git a/t4_devkit/schema/tables/vehicle_state.py b/t4_devkit/schema/tables/vehicle_state.py
index d6168e2..a8cf3c9 100644
--- a/t4_devkit/schema/tables/vehicle_state.py
+++ b/t4_devkit/schema/tables/vehicle_state.py
@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from enum import Enum
+from enum import Enum, unique
 
 from attrs import define, field
 
@@ -11,6 +11,7 @@
 __all__ = ["ShiftState", "IndicatorState", "Indicators", "AdditionalInfo", "VehicleState"]
 
 
+@unique
 class ShiftState(str, Enum):
     """An enum to represent gear shift state."""
 
@@ -23,6 +24,7 @@ class ShiftState(str, Enum):
     NONE = "NONE"
 
 
+@unique
 class IndicatorState(str, Enum):
     """An enum to represent indicator state."""
 
diff --git a/t4_devkit/schema/tables/visibility.py b/t4_devkit/schema/tables/visibility.py
index 24445af..6b0c90c 100644
--- a/t4_devkit/schema/tables/visibility.py
+++ b/t4_devkit/schema/tables/visibility.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 import warnings
-from enum import Enum
+from enum import Enum, unique
 
 from attrs import define, field
 from typing_extensions import Self
@@ -13,6 +13,7 @@
 __all__ = ("Visibility", "VisibilityLevel")
 
 
+@unique
 class VisibilityLevel(str, Enum):
     """An enum to represent visibility levels.