diff --git a/tests/unit/cipher_test.py b/tests/unit/cipher_test.py
index 7d833928..021f0574 100644
--- a/tests/unit/cipher_test.py
+++ b/tests/unit/cipher_test.py
@@ -203,7 +203,7 @@ def test_impossible_differential_search():
 
 def test_is_algebraically_secure():
     aes = AESBlockCipher(word_size=4, state_size=2, number_of_rounds = 1)
-    assert aes.is_algebraically_secure(10) is False
+    assert aes.is_algebraically_secure(20) is False
 
 
 def test_is_andrx():