diff --git a/libagent/tests/test_util.py b/libagent/tests/test_util.py
index 5a1310b..ead8970 100644
--- a/libagent/tests/test_util.py
+++ b/libagent/tests/test_util.py
@@ -101,7 +101,7 @@ def test_reader():
 
 
 def test_setup_logging():
-    util.setup_logging(verbosity=10)
+    util.setup_logging(verbosity=10, filename='/dev/null')
 
 
 def test_memoize():