diff --git a/include/billy_objects.hpp b/include/billy_objects.hpp
index d03879a..58ec363 100644
--- a/include/billy_objects.hpp
+++ b/include/billy_objects.hpp
@@ -74,11 +74,7 @@ namespace character {
 
         static void change_carac(const billyObjects &arg,
                                  CharacterSheet &sheet,
-                                 characteristic::Characteristic &localHabilete,
-                                 characteristic::Characteristic &localAdresse,
-                                 characteristic::Characteristic &localEndurance,
-                                 characteristic::Characteristic &localChance,
-                                 const std::function<std::uint32_t(std::uint32_t, std::uint32_t)> &operation) noexcept;
+                                 const std::function<uint32_t(uint32_t, uint32_t)> &operation) noexcept;
     };
 }
 
diff --git a/src/billy_objects.cpp b/src/billy_objects.cpp
index 7fd747c..526ba41 100644
--- a/src/billy_objects.cpp
+++ b/src/billy_objects.cpp
@@ -40,18 +40,13 @@ namespace character {
             const auto &object = sheet.objects[objType];
             sheet.available_objects.erase(objType);
 
-            auto &local_habilete = static_cast<Characteristic &>(sheet.habilete);
-            auto &local_adresse = static_cast<Characteristic &>(sheet.adresse);
-            auto &local_endurance = static_cast<Characteristic &>(sheet.endurance);
-            auto &local_chance = static_cast<Characteristic &>(sheet.chance);
-
             std::visit(overloaded{
                            [&](const weapons &) { ++sheet.nb_weapons; },
                            [&](const equipments &) { ++sheet.nb_equipments; },
                            [&](const tools &) { ++sheet.nb_tools; },
                        },
                        objType);
-            change_carac(object, sheet, local_habilete, local_adresse, local_endurance, local_chance, plus);
+            change_carac(object, sheet, plus);
             return true;
         }
         return false;
@@ -63,18 +58,13 @@ namespace character {
             sheet.objects.erase(objToErase);
             sheet.available_objects.insert(objToErase);
 
-            auto &local_habilete = static_cast<Characteristic &>(sheet.habilete);
-            auto &local_adresse = static_cast<Characteristic &>(sheet.adresse);
-            auto &local_endurance = static_cast<Characteristic &>(sheet.endurance);
-            auto &local_chance = static_cast<Characteristic &>(sheet.chance);
-
             std::visit(overloaded{
                            [&](const weapons &) { --sheet.nb_weapons; },
                            [&](const equipments &) { --sheet.nb_equipments; },
                            [&](const tools &) { --sheet.nb_tools; }
                        },
                        objToErase);
-            change_carac(obj, sheet, local_habilete, local_adresse, local_endurance, local_chance, minus);
+            change_carac(obj, sheet, minus);
             return true;
         }
         return false;
@@ -86,16 +76,12 @@ namespace character {
 
     void BillyObjects::change_carac(const billyObjects &arg,
                                     CharacterSheet &sheet,
-                                    Characteristic &localHabilete,
-                                    Characteristic &localAdresse,
-                                    Characteristic &localEndurance,
-                                    Characteristic &localChance,
-                                    const std::function<std::uint32_t(std::uint32_t, std::uint32_t)> &operation)
+                                    const std::function<uint32_t(uint32_t, uint32_t)> &operation)
         noexcept {
-        localHabilete.materiel = operation(localHabilete.materiel, arg->add_materiel(localHabilete.type));
-        localAdresse.materiel = operation(localAdresse.materiel, arg->add_materiel(localAdresse.type));
-        localEndurance.materiel = operation(localEndurance.materiel, arg->add_materiel(localEndurance.type));
-        localChance.materiel = operation(localChance.materiel, arg->add_materiel(localChance.type));
+        sheet.habilete.materiel = operation(sheet.habilete.materiel, arg->add_materiel(sheet.habilete.type));
+        sheet.adresse.materiel = operation(sheet.adresse.materiel, arg->add_materiel(sheet.adresse.type));
+        sheet.endurance.materiel = operation(sheet.endurance.materiel, arg->add_materiel(sheet.endurance.type));
+        sheet.chance.materiel = operation(sheet.chance.materiel, arg->add_materiel(sheet.chance.type));
         sheet.armor = operation(sheet.armor, arg->add_armor());
         sheet.damage = operation(sheet.armor, arg->add_damage());
         sheet.critique = operation(sheet.critique, arg->add_critique());