diff --git a/tests/unit/test_file.py b/tests/unit/test_file.py
index de1d06178..15ac4b0a4 100644
--- a/tests/unit/test_file.py
+++ b/tests/unit/test_file.py
@@ -563,9 +563,8 @@ def test_simple(self):
         with NWBHDF5IO(self.path, 'w') as io:
             io.write(nwbfile, cache_spec=False)
 
-        with self.assertWarnsWith(UserWarning, "No cached namespaces found in %s" % self.path):
-            with NWBHDF5IO(self.path, 'r') as reader:
-                nwbfile = reader.read()
+        with NWBHDF5IO(self.path, 'r') as reader:
+            nwbfile = reader.read()
 
 
 class TestTimestampsRefDefault(TestCase):