diff --git a/tools/ratbagctl.test.in b/tools/ratbagctl.test.in
index 96b192b1..dfbf6c9b 100755
--- a/tools/ratbagctl.test.in
+++ b/tools/ratbagctl.test.in
@@ -110,6 +110,8 @@ class TestRatbagCtl(unittest.TestCase):
     def launch_good_test(self, params):
         returncode, stdout, stderr = self.run_ratbagctl(params)
         self.assertEqual(returncode, 0, msg=stderr + stdout)
+        self.maxDiff = None
+        self.assertEqual(stderr, '')
         return stdout
 
     def launch_fail_test(self, params):