diff --git a/boxes/generators/pulley.py b/boxes/generators/pulley.py
index 490dc02..0f119b8 100644
--- a/boxes/generators/pulley.py
+++ b/boxes/generators/pulley.py
@@ -27,7 +27,7 @@ class Pulley(Boxes):
     def __init__(self):
         Boxes.__init__(self)
         # remove cli params you do not need
-        self.buildArgParser("h")
+        self.buildArgParser(h=6.)
         self.argparser.add_argument(
             "--profile", action="store", type=str, default="GT2_2mm",
             choices=pulley.Pulley.getProfiles(),