diff --git a/mod_oop/3.9_10_stack_iter.py b/mod_oop/3.9_10_stack_iter.py
index af96b6d..98df3c9 100644
--- a/mod_oop/3.9_10_stack_iter.py
+++ b/mod_oop/3.9_10_stack_iter.py
@@ -145,7 +145,7 @@ class Stack:
         self.validate_index(idx)
 
         if idx == len(self):
-            self.push(value)
+            self.push_back(value)
             return
 
         prev = self.top