diff --git a/include/characteristic.hpp b/include/characteristic.hpp
index f4d886d..ad8f167 100644
--- a/include/characteristic.hpp
+++ b/include/characteristic.hpp
@@ -12,7 +12,6 @@ namespace character {
 }
 
 namespace character::characteristic {
-
     /*!
      * \brief Different characteristic type
      */
@@ -41,7 +40,7 @@ namespace character::characteristic {
         std::uint32_t carac{ 0 };
 
         //! Value changed from a billyObjects (billyEnums) possessed
-        std::uint32_t materiel{ 0 };
+        std::int32_t materiel{ 0 };
 
         //! Additional value when creating the character
         std::uint32_t additional{ 0 };
@@ -70,7 +69,7 @@ namespace character::characteristic {
 
         constexpr Characteristic(const characType inType,
                                  const std::uint32_t carac,
-                                 const std::uint32_t materiel,
+                                 const std::int32_t materiel,
                                  const std::uint32_t additional) :
             base(get_base(inType)),
             carac(carac),
@@ -98,11 +97,11 @@ namespace character::characteristic {
 
         [[nodiscard]] std::uint32_t get_carac() const { return carac; }
 
-        [[nodiscard]] std::uint32_t get_materiel() const { return materiel; }
+        [[nodiscard]] std::int32_t get_materiel() const { return materiel; }
 
         [[nodiscard]] std::uint32_t get_additional() const { return additional; }
 
-        [[nodiscard]] std::size_t get_total() const noexcept {
+        [[nodiscard]] std::int32_t get_total() const noexcept {
             if (total == defaultValue::max()) {
                 total = static_cast<std::int32_t>(base + carac + materiel + additional);
                 total = std::max(total, 0);
@@ -114,7 +113,7 @@ namespace character::characteristic {
             const_cast<std::uint32_t &>(charac.base) = j.at("base").get<std::uint32_t>();
             const_cast<characType &>(charac.type) = static_cast<characType>(j.at("type").get<std::uint8_t>());
             charac.carac = j.at("carac").get<std::uint32_t>();
-            charac.materiel = j.at("materiel").get<std::uint32_t>();
+            charac.materiel = j.at("materiel").get<std::int32_t>();
             charac.additional = j.at("additional").get<std::uint32_t>();
             charac.total = j.at("total").get<std::int32_t>();
         }