diff --git a/tests/unit/converters/test_pgm_json_converter.py b/tests/unit/converters/test_pgm_json_converter.py
index 8dbf8876..dc54b9c9 100644
--- a/tests/unit/converters/test_pgm_json_converter.py
+++ b/tests/unit/converters/test_pgm_json_converter.py
@@ -64,7 +64,7 @@ def pgm_sparse_batch_data():
 
 
 def test_parse_data(converter: PgmJsonConverter, structured_input_data, structured_batch_data):
-    with pytest.raises(PowerGridSerializationError, match="Expect a map or array."):
+    with pytest.raises(PowerGridSerializationError, match="Map or an array expected."):
         converter._parse_data(data="str", data_type="input", extra_info=None)  # type: ignore
 
     # test for input dataset