diff --git a/src/aijack/attack/labelleakage/normattack.py b/src/aijack/attack/labelleakage/normattack.py
index b69d232a..7b63b9fc 100644
--- a/src/aijack/attack/labelleakage/normattack.py
+++ b/src/aijack/attack/labelleakage/normattack.py
@@ -42,7 +42,7 @@ def attack(self, dataloader):
             """
             epoch_labels = []
             epoch_g_norm = []
-            for i, data in enumerate(dataloader, 0):
+            for data in dataloader:
                 inputs, labels = data
                 inputs = inputs.to(self.device)
                 labels = labels.to(self.device)