diff --git a/swh/deposit/tests/test_utils.py b/swh/deposit/tests/test_utils.py
--- a/swh/deposit/tests/test_utils.py
+++ b/swh/deposit/tests/test_utils.py
@@ -285,7 +285,10 @@
 @pytest.mark.parametrize(
     "invalid_swhid,error_msg",
     [
-        ("swh:1:cnt:31b5c8cc985d190b5a7ef4878128ebfdc235", "Unexpected length"),
+        (
+            "swh:1:cnt:31b5c8cc985d190b5a7ef4878128ebfdc235",
+            "Invalid SWHID: invalid syntax",
+        ),
         (
             "swh:1:dir:c4993c872593e960dc84e4430dbbfbc34fd706d0;visit=swh:1:rev:0175049fc45055a3824a1675ac06e3711619a55a",  # noqa
             "visit qualifier should be a core SWHID with type",