diff --git a/tests/test_cpp_base_py_derived.py b/tests/test_cpp_base_py_derived.py
index 3a36c81fe..ca30f0f98 100644
--- a/tests/test_cpp_base_py_derived.py
+++ b/tests/test_cpp_base_py_derived.py
@@ -23,7 +23,7 @@ class drvd(m.base):
 def test_base():
   b = m.base()
   assert b.get_num() == 100
-  m.get_num(b) == 100
+  assert m.get_num(b) == 100
   bc = b.clone()
   assert bc.get_num() == 150
   assert m.clone_get_num(b) == 103157