diff --git a/extraction/core/functions/cell.py b/extraction/core/functions/cell.py
index 01debba5b9bf0ee93703c3d32673a9150031e297..77179cc4f67183b9180d7ffd12e0a50e6ba7a4b6 100644
--- a/extraction/core/functions/cell.py
+++ b/extraction/core/functions/cell.py
@@ -65,7 +65,7 @@ def max2p5pc_med(cell_mask, trap_image):
     top_vals = sorted_vals[-top_pixels:]
     max2p5pc = np.mean(top_vals, dtype=float)
 
-    return max5pc / sorted_vals[len(sorted_vals) // 2]
+    return max2p5pc / sorted_vals[len(sorted_vals) // 2]
 
 
 def std(cell_mask, trap_image):