diff --git a/tests/qinfo/test_reduced_dm.py b/tests/qinfo/test_reduced_dm.py
index 0b8c1d2d403..efe3d0701ae 100644
--- a/tests/qinfo/test_reduced_dm.py
+++ b/tests/qinfo/test_reduced_dm.py
@@ -175,7 +175,7 @@ def circuit(x):
     def test_density_matrix_c_dtype(self, wires, c_dtype):
         """Test different complex dtype."""
 
-        dev = qml.device("default.qubit", wires=2, c_dtype=c_dtype)
+        dev = qml.device("default.mixed", wires=2, c_dtype=c_dtype)
 
         @qml.qnode(dev, diff_method=None)
         def circuit(x):