diff --git a/openeo_driver/ProcessGraphDeserializer.py b/openeo_driver/ProcessGraphDeserializer.py
index 0f4ec397..4312cab8 100644
--- a/openeo_driver/ProcessGraphDeserializer.py
+++ b/openeo_driver/ProcessGraphDeserializer.py
@@ -1993,23 +1993,24 @@ def mask_scl_dilation(args: Dict, env: EvalEnv):
 
 @process_registry_100.add_function(spec=read_spec("openeo-processes/experimental/to_scl_dilation_mask.json"))
 @process_registry_2xx.add_function(spec=read_spec("openeo-processes/experimental/to_scl_dilation_mask.json"))
-def to_scl_dilation_mask(args: Dict, env: EvalEnv):
-    cube: DriverDataCube = extract_arg(args, "data")
-    if not isinstance(cube, DriverDataCube):
-        raise ProcessParameterInvalidException(
-            parameter="data",
-            process="to_scl_dilation_mask",
-            reason=f"Invalid data type {type(cube)!r} expected raster-cube.",
-        )
+def to_scl_dilation_mask(args: ProcessArgs, env: EvalEnv):
+    cube: DriverDataCube = args.get_required("data", expected_type=DriverDataCube)
+
     if hasattr(cube, "to_scl_dilation_mask"):
-        erosion_kernel_size = args.get("erosion_kernel_size", 0)
-        mask1_values = args.get("mask1_values", [2, 4, 5, 6, 7])
-        mask2_values = args.get("mask2_values", [3, 8, 9, 10, 11])
-        kernel1_size = args.get("kernel1_size", 17)
-        kernel2_size = args.get("kernel2_size", 201)
-        return cube.to_scl_dilation_mask(erosion_kernel_size, mask1_values, mask2_values, kernel1_size, kernel2_size)
+        spec = read_spec("openeo-processes/experimental/to_scl_dilation_mask.json")
+        optionals = {
+            arg: args.get_optional(arg, default=spec["parameters"][arg]["default"])
+            for arg in [
+                "erosion_kernel_size",
+                "mask1_values",
+                "mask2_values",
+                "kernel1_size",
+                "kernel2_size",
+            ]
+        }
+        return cube.to_scl_dilation_mask(**optionals)
     else:
-        return cube
+        raise FeatureUnsupportedException(message="to_scl_dilation_mask is not supported")
 
 
 @process_registry_100.add_function(spec=read_spec("openeo-processes/experimental/mask_l1c.json"))