diff --git a/tests/generators/ssz_generic/ssz_container.py b/tests/generators/ssz_generic/ssz_container.py
index 818361fda..70e765c0c 100644
--- a/tests/generators/ssz_generic/ssz_container.py
+++ b/tests/generators/ssz_generic/ssz_container.py
@@ -128,7 +128,7 @@ def invalid_cases():
                         if mode == RandomizationMode.mode_max_count:
                             serialized = serialize(container_case_fn(rng, mode, typ))
                             serialized = serialized + serialized[:2]
-                            yield f'{name}_{mode.to_name()}_last offset_{offset_index}_overflow', \
+                            yield f'{name}_{mode.to_name()}_last_offset_{offset_index}_overflow', \
                                 invalid_test_case(lambda: serialized)
                         if mode == RandomizationMode.mode_one_count:
                             serialized = serialize(container_case_fn(rng, mode, typ))