diff --git a/webapp/services/FormulaService.php b/webapp/services/FormulaService.php
index 6ed0a55a..16a94b2d 100644
--- a/webapp/services/FormulaService.php
+++ b/webapp/services/FormulaService.php
@@ -88,9 +88,9 @@ class FormulaService extends BaseService {
         $lucky = 0;
         $upLimit = round(
             (
-                0.0111*pow($heroDb['quality'],3) -
-                0.25974*pow($heroDb['quality'],2) +
-                3.29292*$heroDb['quality'] +
+                0.0111*pow($weaponDb['quality'],3) -
+                0.25974*pow($weaponDb['quality'],2) +
+                3.29292*$weaponDb['quality'] +
                 1.3389
             ) +
             (
@@ -110,9 +110,9 @@ class FormulaService extends BaseService {
         $lucky = 0;
         $upLimit = round(
             (
-                0.0259*pow($heroDb['quality'],3) -
-                0.6061*pow($heroDb['quality'],2) +
-                7.6836*$heroDb['quality'] +
+                0.0259*pow($weaponDb['quality'],3) -
+                0.6061*pow($weaponDb['quality'],2) +
+                7.6836*$weaponDb['quality'] +
                 3.1241
             ) +
             (