diff --git a/Assets/UniGLTF/MeshUtility/Runtime/Validation.cs b/Assets/UniGLTF/MeshUtility/Runtime/Validation.cs
index 82aee82aa..ae9a00588 100644
--- a/Assets/UniGLTF/MeshUtility/Runtime/Validation.cs
+++ b/Assets/UniGLTF/MeshUtility/Runtime/Validation.cs
@@ -50,7 +50,9 @@ namespace MeshUtility
         {
             ErrorLevel = canExport;
             Message = message;
+#if UNITY_EDITOR
             Extended = extended;
+#endif
         }
 
 #if UNITY_EDITOR