diff --git a/src/anemoi/inference/metadata.py b/src/anemoi/inference/metadata.py
index 5eb674a..c12b833 100644
--- a/src/anemoi/inference/metadata.py
+++ b/src/anemoi/inference/metadata.py
@@ -718,9 +718,7 @@ def boundary_forcings_inputs(self, context, input_state):
 
         result = []
 
-        output_mask = self._config_model.get("output_mask", None)
-        if output_mask is not None:
-            assert output_mask == "cutout", "Currently only cutout as output mask supported."
+        if "output_mask" in self._supporting_arrays:
             result.append(
                 context.create_boundary_forcings(
                     self.prognostic_variables,