diff --git a/tests/unit/utils_test/test_data_utils.py b/tests/unit/utils_test/test_data_utils.py
index e432358be..6b6a1d298 100644
--- a/tests/unit/utils_test/test_data_utils.py
+++ b/tests/unit/utils_test/test_data_utils.py
@@ -20,7 +20,7 @@ class TestAppendData(TestCase):
     def test_append_exception(self):
         data = MyIterable([1, 2, 3, 4, 5])
         with self.assertRaises(ValueError):
-            rappend_data(data, 4)
+            append_data(data, 4)
 
 
 class TestZarrAppendData(TestCase):
@@ -32,7 +32,7 @@ def setUp(self):
     def test_append_exception(self):
         data = MyIterable([1, 2, 3, 4, 5])
         with self.assertRaises(ValueError):
-            rappend_data(data, 4)
+            append_data(data, 4)
 
     def test_append_data_zarr(self):
         zarr_array = zarr.array([1,2,3])