diff --git a/tasksetgen.py b/tasksetgen.py
index 4768b83..c639d66 100755
--- a/tasksetgen.py
+++ b/tasksetgen.py
@@ -21,6 +21,7 @@ import random
 import argparse
 import json
 import math
+import copy
 from enum import Enum
 
 def query_yes_no(question, default=None):
@@ -202,6 +203,7 @@ def main():
                 if utility[0] <= taskset_util <= utility[1]:
                     if len(taskset) >= args.cores + 1:
                         tasksets.append(taskset)
+                        taskset = copy.deepcopy(taskset)
 
     now = datetime.datetime.now()