diff --git a/tests/ops/op_math/test_adjoint_op.py b/tests/ops/op_math/test_adjoint_op.py
index 4c2bfe22a3c..b381ea72315 100644
--- a/tests/ops/op_math/test_adjoint_op.py
+++ b/tests/ops/op_math/test_adjoint_op.py
@@ -502,6 +502,15 @@ def test_do_queue_False(self):
 class TestMatrix:
     """Test the matrix method for a variety of interfaces."""
 
+    def test_batching_error(self):
+        """Test that a MatrixUndefinedError is raised if the base is batched."""
+        x = qml.numpy.array([0.1, 0.2, 0.3])
+        base = qml.RX(x, wires=0)
+        op = Adjoint(base)
+
+        with pytest.raises(qml.operation.MatrixUndefinedError):
+            op.matrix()
+
     def check_matrix(self, x, interface):
         """Compares matrices in a interface independent manner."""
         base = qml.RX(x, wires=0)