diff --git a/challenge_19/python/slandau3/group5.py b/challenge_19/python/slandau3/group5.py
index 083ae9a..c8d7a9e 100644
--- a/challenge_19/python/slandau3/group5.py
+++ b/challenge_19/python/slandau3/group5.py
@@ -6,7 +6,7 @@ def chosen(start, nums, target):
         return False
     else:
         for i in range(start, len(nums)):
-            nc = nums.copy()
+            nc = nums[:]
             if i == 0:
                 continue