diff --git a/fail2ban/tests/servertestcase.py b/fail2ban/tests/servertestcase.py
index fd2a22cc..062284f7 100644
--- a/fail2ban/tests/servertestcase.py
+++ b/fail2ban/tests/servertestcase.py
@@ -804,7 +804,7 @@ class RegexTests(unittest.TestCase):
 
 class _BadThread(JailThread):
 	def run(self):
-		int("cat")
+		int("ignore this exception -- raised for testing")
 
 class LoggingTests(LogCaptureTestCase):