diff --git a/kedro-telemetry/tests/test_masking.py b/kedro-telemetry/tests/test_masking.py
index 8d4698591..782de29ec 100644
--- a/kedro-telemetry/tests/test_masking.py
+++ b/kedro-telemetry/tests/test_masking.py
@@ -11,7 +11,6 @@
 from kedro_telemetry.masking import (
     MASK,
     _get_cli_structure,
-    _get_vocabulary,
     _mask_kedro_cli,
     _recursive_items,
 )
@@ -175,9 +174,6 @@ def test_recursive_items(self, input_dict, expected_output_count):
     def test_recursive_items_empty(self):
         assert len(list(_recursive_items({}))) == 0
 
-    def test_get_vocabulary_empty(self):
-        assert _get_vocabulary({}) == {"-h", "--version"}
-
     @pytest.mark.parametrize(
         "input_cli_structure, input_command_args, expected_masked_args",
         [