diff --git a/problems/medium/m17.py b/problems/medium/m17.py
index e857a27..b0dc40b 100644
--- a/problems/medium/m17.py
+++ b/problems/medium/m17.py
@@ -1,16 +1,11 @@
 '''Write a program to reverse a given list without using built-in functions'''
 def reverse_list(lst):
-    start = -1
-    end = -len(lst) 
-    
-    
-    while start > end:
-       
+    start = 0
+    end = len(lst)-1
+    while start < end:
         lst[start], lst[end] = lst[end], lst[start]
-        
-         
-        start -= 1
-        end += 1
+        start += 1
+        end -= 1
     
     return lst