diff --git a/src/pydase/data_service/data_service.py b/src/pydase/data_service/data_service.py
index 3c4a0c3..97c4678 100644
--- a/src/pydase/data_service/data_service.py
+++ b/src/pydase/data_service/data_service.py
@@ -185,6 +185,10 @@ class DataService(rpyc.Service, AbstractDataService):
                 parts = path.split(".")
                 attr_name = parts[-1]
 
+                # Convert dictionary into Quantity
+                if class_value_type == "Quantity":
+                    value = u.convert_to_quantity(value)
+
                 self.update_DataService_attribute(parts[:-1], attr_name, value)
             else:
                 logger.info(
diff --git a/src/pydase/utils/helpers.py b/src/pydase/utils/helpers.py
index c9a7aca..8d2d053 100644
--- a/src/pydase/utils/helpers.py
+++ b/src/pydase/utils/helpers.py
@@ -5,7 +5,16 @@ from typing import Any, Optional, cast
 
 logger = logging.getLogger(__name__)
 
-STANDARD_TYPES = ("int", "float", "bool", "str", "Enum", "NoneType", "Quantity")
+STANDARD_TYPES = (
+    "int",
+    "float",
+    "bool",
+    "str",
+    "Enum",
+    "NoneType",
+    "Quantity",
+    "ColouredEnum",
+)
 
 
 def get_class_and_instance_attributes(obj: object) -> dict[str, Any]:
diff --git a/tests/test_units.py b/tests/test_units.py
index 55b6aa3..9d28cb9 100644
--- a/tests/test_units.py
+++ b/tests/test_units.py
@@ -124,3 +124,44 @@ def test_autoconvert_offset_to_baseunit() -> None:
         quantity = 10 * u.units.degC
     except pint.errors.OffsetUnitCalculusError as exc:
         assert False, f"Offset unit raises exception {exc}"
+
+
+def test_loading_from_json(capsys: CaptureFixture) -> None:
+    """This function tests if the quantity read from the json description is actually
+    passed as a quantity to the property setter."""
+    JSON_DICT = {
+        "some_unit": {
+            "type": "Quantity",
+            "value": {"magnitude": 10.0, "unit": "A"},
+            "readonly": False,
+            "doc": None,
+        }
+    }
+
+    class ServiceClass(DataService):
+        def __init__(self):
+            self._unit: u.Quantity = 1 * u.units.A
+            super().__init__()
+
+        @property
+        def some_unit(self) -> u.Quantity:
+            return self._unit
+
+        @some_unit.setter
+        def some_unit(self, value: u.Quantity) -> None:
+            assert isinstance(value, u.Quantity)
+            self._unit = value
+
+    service = ServiceClass()
+
+    service.load_DataService_from_JSON(JSON_DICT)
+
+    captured = capsys.readouterr()
+
+    expected_output = sorted(
+        [
+            "ServiceClass.some_unit = 10.0 A",
+        ]
+    )
+    actual_output = sorted(captured.out.strip().split("\n"))  # type: ignore
+    assert actual_output == expected_output