diff --git a/nanochat/checkpoint_manager.py b/nanochat/checkpoint_manager.py
index afba340..530e6d3 100644
--- a/nanochat/checkpoint_manager.py
+++ b/nanochat/checkpoint_manager.py
@@ -117,7 +117,7 @@ def find_last_step(checkpoint_dir):
     checkpoint_files = [f for f in os.listdir(checkpoint_dir) if re.search(r'model_(\d+)\.pt$', f)]
     if not checkpoint_files:
         raise FileNotFoundError(f"No checkpoints found in {checkpoint_dir}")
-    last_step = int(max(f.split("_")[-1].split(".")[0] for f in checkpoint_files))
+    last_step = max(int(f.split("_")[-1].split(".")[0]) for f in checkpoint_files)
     return last_step
 
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