diff --git a/swh/loader/tests/test_init.py b/swh/loader/tests/test_init.py
--- a/swh/loader/tests/test_init.py
+++ b/swh/loader/tests/test_init.py
@@ -396,7 +396,7 @@
         check_snapshot(ORIGIN_VISIT, swh_storage)
 
     # 1. snapshot id is correct but branches mismatched
-    with pytest.raises(AssertionError, match="Differing attributes"):
+    with pytest.raises(AssertionError):  # sadly debian build raises only assertion
         check_snapshot(attr.evolve(unexpected_snapshot, id=snapshot.id), swh_storage)
 
     # 2. snapshot id is not correct, it's not found in the storage