diff --git a/test/test_solver.py b/test/test_solver.py
index 0a04626..be6b309 100644
--- a/test/test_solver.py
+++ b/test/test_solver.py
@@ -13,7 +13,7 @@ class SolverTest(unittest.TestCase):
     def test_solver(self) -> None:
         """Tests solver"""
         board_copy = copy.deepcopy(TEST_BOARD)
-        board_id = TEST_BOARD.state_identifier
+        board_id = TEST_BOARD.state_identifier  # type: ignore
         board_solution_iterator = solver.solve(TEST_BOARD)
         for _, current_solution in zip(range(1), board_solution_iterator):
             self.assertEqual(board_id, board_copy.state_identifier)