diff --git a/tests/python_tests/filter_test.py b/tests/python_tests/filter_test.py
index 6a6200f39..34faecb34 100644
--- a/tests/python_tests/filter_test.py
+++ b/tests/python_tests/filter_test.py
@@ -232,6 +232,7 @@ def test_creation_of_bool():
 
 null_equality = [
   ['hello',False,unicode],
+  [u'',False,unicode],
   [0,False,int],
   [123,False,int],
   [0.0,False,float],