diff --git a/tests/CLI/modules/block_tests.py b/tests/CLI/modules/block_tests.py
index 225476976..6c74899f0 100644
--- a/tests/CLI/modules/block_tests.py
+++ b/tests/CLI/modules/block_tests.py
@@ -59,7 +59,7 @@ def test_volume_detail(self):
         result = self.run_command(['block', 'volume-detail', '1234'])
 
         self.assert_no_fail(result)
-        isinstance(json.loads(result.output)['IOPs'], float)
+	assert isinstance(json.loads(result.output)['IOPs'], float)
         self.assertEqual({
             'Username': 'username',
             'LUN Id': '2',