diff --git a/mmp/a4/label_grid.py b/mmp/a4/label_grid.py
index c16e182..ebc3d12 100644
--- a/mmp/a4/label_grid.py
+++ b/mmp/a4/label_grid.py
@@ -26,9 +26,9 @@ def get_label_grid(
     label_grid = np.empty(anchor_grid.shape[:-1], dtype=bool)
     for (width, ratio, row, col), item in np.ndenumerate(anchor_grid):
         for gt in gts:
-            iou = iou(item, gt)
+            calculated_iou = iou(item, gt)
             label_grid[width, ratio, row, col] = False
-            if iou >= min_iou:
+            if calculated_iou >= min_iou:
                 label_grid[width, ratio, row, col] = True
                 break
     return label_grid