diff --git a/ui/loadout_manager.py b/ui/loadout_manager.py
index b188738..a5db499 100644
--- a/ui/loadout_manager.py
+++ b/ui/loadout_manager.py
@@ -1698,7 +1698,7 @@ class LoadoutManagerDialog(QDialog):
                             electric=matching_armor.protection_electric,
                         ),
                         durability=matching_armor.durability,
-                        decay_per_hp=Decimal("0.05") * (1 - matching_armor.durability / 100000)
+                        decay_per_hp=Decimal("0.05") * (Decimal(1) - Decimal(matching_armor.durability) / Decimal("100000"))
                     )
                     slot_widget.set_piece(piece)
                     pieces_found += 1