diff --git a/src/Core/Resource/Script/CScriptLayer.h b/src/Core/Resource/Script/CScriptLayer.h
index 57a29923..c424c9b8 100644
--- a/src/Core/Resource/Script/CScriptLayer.h
+++ b/src/Core/Resource/Script/CScriptLayer.h
@@ -27,9 +27,9 @@ public:
     }
 
     // Data Manipulation
-    void AddInstance(CScriptObject *pObject, uint32 Index = -1)
+    void AddInstance(CScriptObject *pObject, uint32 Index = UINT32_MAX)
     {
-        if (Index != -1 && Index < mInstances.size())
+        if (Index != UINT32_MAX && Index < mInstances.size())
         {
             auto it = mInstances.begin();
             std::advance(it, Index);
diff --git a/src/Core/ScriptExtra/CScriptExtra.h b/src/Core/ScriptExtra/CScriptExtra.h
index 9eb08c79..a24a94b5 100644
--- a/src/Core/ScriptExtra/CScriptExtra.h
+++ b/src/Core/ScriptExtra/CScriptExtra.h
@@ -27,7 +27,7 @@ protected:
 
 public:
     explicit CScriptExtra(CScriptObject *pInstance, CScene *pScene, CScriptNode *pParent = nullptr)
-        : CSceneNode(pScene, -1, pParent)
+        : CSceneNode(pScene, UINT32_MAX, pParent)
         , mpScriptNode(pParent)
         , mpInstance(pInstance)
         , mGame(pInstance->Template()->Game())