diff --git a/strat/main.py b/strat/main.py
index 3ad2b2f..61a1782 100644
--- a/strat/main.py
+++ b/strat/main.py
@@ -2,7 +2,7 @@ import numpy as np
 
 
 def avg(ls: list) -> int:
-    if len != 0:
+    if len(ls) != 0:
         return sum(ls) / len(ls)
     else:
         return 0