diff --git a/test/unit_tests/braket/default_simulator/test_operation_helpers.py b/test/unit_tests/braket/default_simulator/test_operation_helpers.py
index fbe6adea..b43ba7e0 100644
--- a/test/unit_tests/braket/default_simulator/test_operation_helpers.py
+++ b/test/unit_tests/braket/default_simulator/test_operation_helpers.py
@@ -35,7 +35,7 @@
     (np.array([1])),
     (np.array([0, 1, 2])),
     (np.array([[0, 1], [1, 2], [3, 4]])),
-    (np.array([[0, 1, 2], [2, 3]])),
+    (np.array([[0, 1, 2], [2, 3]], dtype=object)),
     (np.array([[0, 1, 2], [3, 4, 5], [6, 7, 8]])),
 ]