diff --git a/GPy/testing/__init__.py b/GPy/testing/__init__.py
index aad6a46d..f5a4c54f 100644
--- a/GPy/testing/__init__.py
+++ b/GPy/testing/__init__.py
@@ -7,6 +7,6 @@ import unittest
 import sys
 
 def deepTest(reason):
-    if 'deep' in reason:
+    if reason:
         return lambda x:x
     return unittest.skip("Not deep scanning, enable deepscan by adding 'deep' argument")