diff --git a/script/tweaK.py b/script/tweaK.py
index 0f4b887..4bfe1e6 100644
--- a/script/tweaK.py
+++ b/script/tweaK.py
@@ -4,7 +4,7 @@ def tweak(positioner, step):
     positioner=to_list(string_to_obj(positioner))
     step = to_list(step)
     while (True):
-        key=Shell.waitKey(0)
+        key=get_context().waitKey(0)
         if key == 0x25 : #Left
             for i in range(len(positioner)):
                 positioner[i].moveRel(-step[i])