diff --git a/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.cpp b/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.cpp
index 275b7c00..c2e3dce9 100644
--- a/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.cpp
+++ b/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.cpp
@@ -31,10 +31,24 @@ const CommonExpressionUnaryOperationType CommonExpressionUnaryOperationType::OPE
     }
 );
 
+const CommonExpressionUnaryOperationType CommonExpressionUnaryOperationType::OPERATION_NEGATIVE(
+    "-",
+    [](const CommonExpressionValue& operand) -> CommonExpressionValue
+    {
+        if(operand.m_type == CommonExpressionValue::Type::INT)
+            return CommonExpressionValue(-operand.m_int_value);
+        if (operand.m_type == CommonExpressionValue::Type::DOUBLE)
+            return CommonExpressionValue(-operand.m_double_value);
+
+        return CommonExpressionValue(0);
+    }
+);
+
 const CommonExpressionUnaryOperationType* const CommonExpressionUnaryOperationType::ALL_OPERATION_TYPES[static_cast<int>(UnaryOperationId::COUNT)]
 {
     &OPERATION_NOT,
     &OPERATION_BITWISE_NOT,
+    &OPERATION_NEGATIVE,
 };
 
 CommonExpressionUnaryOperation::CommonExpressionUnaryOperation(const CommonExpressionUnaryOperationType* operationType, std::unique_ptr<ICommonExpression> operand)
diff --git a/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.h b/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.h
index 1debd289..6ad3916f 100644
--- a/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.h
+++ b/src/ObjLoading/Parsing/Menu/Domain/Expression/CommonExpressionUnaryOperation.h
@@ -13,6 +13,7 @@ namespace menu
     {
         NOT,
         BITWISE_NOT,
+        NEGATIVE,
 
         COUNT
     };
@@ -31,6 +32,7 @@ namespace menu
     public:
         static const CommonExpressionUnaryOperationType OPERATION_NOT;
         static const CommonExpressionUnaryOperationType OPERATION_BITWISE_NOT;
+        static const CommonExpressionUnaryOperationType OPERATION_NEGATIVE;
 
         static const CommonExpressionUnaryOperationType* const ALL_OPERATION_TYPES[static_cast<int>(UnaryOperationId::COUNT)];
     };
diff --git a/src/ObjLoading/Parsing/Menu/Matcher/MenuCommonMatchers.cpp b/src/ObjLoading/Parsing/Menu/Matcher/MenuCommonMatchers.cpp
index 2afa715a..4cac4301 100644
--- a/src/ObjLoading/Parsing/Menu/Matcher/MenuCommonMatchers.cpp
+++ b/src/ObjLoading/Parsing/Menu/Matcher/MenuCommonMatchers.cpp
@@ -276,6 +276,10 @@ std::unique_ptr<MenuCommonMatchers::matcher_t> MenuCommonMatchers::ParseUnaryOpe
         {
             return SimpleParserValue::Integer(values[0].get().GetPos(), static_cast<int>(UnaryOperationId::BITWISE_NOT));
         }),
+        create.Char('-').Transform([](const MenuMatcherFactory::token_list_t& values)
+        {
+            return SimpleParserValue::Integer(values[0].get().GetPos(), static_cast<int>(UnaryOperationId::NEGATIVE));
+        }),
     }).Tag(TAG_EXPRESSION_UNARY_OPERATION).Capture(CAPTURE_UNARY_OPERATION_TYPE);
 }