diff --git a/uproot4/interpretation/objects.py b/uproot4/interpretation/objects.py
index b618b6577..8bc72e9d2 100644
--- a/uproot4/interpretation/objects.py
+++ b/uproot4/interpretation/objects.py
@@ -215,6 +215,7 @@ def final_array(
                     output[global_i - entry_start] = basket_array[local_i]
 
             elif entry_start < stop and start <= entry_stop:
+                basket_array = basket_arrays[basket_num]
                 for global_i in range(start, stop):
                     local_i = global_i - start
                     output[global_i - entry_start] = basket_array[local_i]