diff --git a/hog/operator_generation/operators.py b/hog/operator_generation/operators.py
index 2e039cd10973ec92076d1ef3ea1488f02b43eebd..ff104c33a346c2c2f48e5a831f0d43c0d03106a2 100644
--- a/hog/operator_generation/operators.py
+++ b/hog/operator_generation/operators.py
@@ -1298,7 +1298,7 @@ class HyTeGElementwiseOperator:
                         sp.Symbol(dof_symbol.name),
                         coeffs[dof_symbol.function_id].local_dofs(
                             geometry,
-                            element_index,
+                            element_index,  # type: ignore[arg-type] # list of sympy expressions also works
                             element_type,
                             indexing_info,
                             element_vertex_order,