diff --git a/tests/unit/utils/test_upgradeability_util.py b/tests/unit/utils/test_upgradeability_util.py
index a291d5680..8dfbccc61 100644
--- a/tests/unit/utils/test_upgradeability_util.py
+++ b/tests/unit/utils/test_upgradeability_util.py
@@ -22,8 +22,16 @@ def test_upgrades_compare() -> None:
     sl = Slither(os.path.join(TEST_DATA_DIR, "TestUpgrades-0.8.2.sol"))
     v1 = sl.get_contract_from_name("ContractV1")[0]
     v2 = sl.get_contract_from_name("ContractV2")[0]
-    missing_vars, new_vars, tainted_vars, new_funcs, modified_funcs, tainted_funcs, tainted_contracts = compare(v1, v2)
-    assert len(missing_vars) == 0
+    (
+        missing_vars,
+        new_vars,
+        tainted_vars,
+        new_funcs,
+        modified_funcs,
+        tainted_funcs,
+        tainted_contracts,
+    ) = compare(v1, v2)
+    assert len(missing_vars) == len(tainted_contracts) == 0
     assert new_vars == [v2.get_state_variable_from_name("stateC")]
     assert tainted_vars == [
         v2.get_state_variable_from_name("stateB"),