diff --git a/tests/autotests/test_task02.py b/tests/autotests/test_task02.py
index ea1f3e670..67ae5cc14 100644
--- a/tests/autotests/test_task02.py
+++ b/tests/autotests/test_task02.py
@@ -38,6 +38,7 @@ def test(self, regex_str: str) -> None:
         dfa = regex_to_dfa(regex_str)
 
         minimized_dfa = dfa.minimize()
+        assert len(minimized_dfa.states) == len(dfa.states)
         assert dfa.is_deterministic()
         assert dfa.is_equivalent_to(minimized_dfa)
         assert dfa.accepts(word)