diff --git a/concrete/numpy/compile.py b/concrete/numpy/compile.py
index a00cbc030..0d7bb559d 100644
--- a/concrete/numpy/compile.py
+++ b/concrete/numpy/compile.py
@@ -157,7 +157,7 @@ def _compile_numpy_function_into_op_graph_internal(
 
     # Make sure the graph can be lowered to MLIR
     if not is_graph_values_compatible_with_mlir(op_graph):
-        raise TypeError("signed integers aren't supported for MLIR lowering")
+        raise RuntimeError("function you are trying to compile isn't supported for MLIR lowering")
 
     # Update bit_width for MLIR
     update_bit_width_for_mlir(op_graph)
diff --git a/tests/numpy/test_compile.py b/tests/numpy/test_compile.py
index 1ef3cd0c3..5f30b9838 100644
--- a/tests/numpy/test_compile.py
+++ b/tests/numpy/test_compile.py
@@ -251,7 +251,7 @@ def test_fail_compile(function, input_ranges, list_of_arg_names):
         arg_name: EncryptedScalar(Integer(64, True)) for arg_name in list_of_arg_names
     }
 
-    with pytest.raises(TypeError, match=r"signed integers aren't supported for MLIR lowering"):
+    with pytest.raises(RuntimeError, match=".*isn't supported for MLIR lowering.*"):
         compile_numpy_function_into_op_graph(
             function,
             function_parameters,