diff --git a/chapter4/quicksort.py b/chapter4/quicksort.py
index 6461ef0..6c019b6 100644
--- a/chapter4/quicksort.py
+++ b/chapter4/quicksort.py
@@ -1,8 +1,3 @@
-def quicksort(arr):
-    if len(arr) < 2:
-        return arr
-
-
 import logging
 import random