diff --git a/test/test_stepsize.py b/test/test_stepsize.py
index b60a363ba..33dbe91d9 100644
--- a/test/test_stepsize.py
+++ b/test/test_stepsize.py
@@ -183,7 +183,7 @@ def test_overshoot_milestone(nb_its, target):
     my_stepsize.milestones = [1.3]
 
     new_value = my_stepsize.modify_value(
-        value=my_stepsize,
+        value=0.5,
         nb_iterations=nb_its,
     )