diff --git a/implementations/Python/joy.py b/implementations/Python/joy.py
index bcf3080..a8ddccf 100644
--- a/implementations/Python/joy.py
+++ b/implementations/Python/joy.py
@@ -2033,7 +2033,7 @@ def dipdd(stack, expr, dictionary):
              ... Q y x z
 
     '''
-    quote, x, y, z, stack = get_n_items(3, stack)
+    quote, x, y, z, stack = get_n_items(4, stack)
     isnt_stack(quote)
     expr = push_quote((z, (y, (x, ()))), expr)
     expr = push_quote(quote, expr)