diff --git a/scripts/chat_sft.py b/scripts/chat_sft.py
index c0471c43..3559ada6 100644
--- a/scripts/chat_sft.py
+++ b/scripts/chat_sft.py
@@ -171,8 +171,8 @@ def get_lr_multiplier(it):
 
 # Go!
 step = 0
-for step in range(num_iterations):
-    last_step = step == num_iterations - 1
+for step in range(num_iterations + 1):
+    last_step = step == num_iterations
 
     # evaluate the validation loss
     if last_step or step % args.eval_every == 0: