diff --git a/Assets/VRM10/MToon10/Runtime/MToonOutlineRenderPass.cs b/Assets/VRM10/MToon10/Runtime/MToonOutlineRenderPass.cs
index 3865807b5..8529aca07 100644
--- a/Assets/VRM10/MToon10/Runtime/MToonOutlineRenderPass.cs
+++ b/Assets/VRM10/MToon10/Runtime/MToonOutlineRenderPass.cs
@@ -18,7 +18,7 @@ namespace VRM10.MToon10
         }
 
 #if UNITY_6000_0_OR_NEWER
-        [Obsolete]
+        [System.Obsolete]
 #endif
         public override void Execute(ScriptableRenderContext context, ref RenderingData renderingData)
         {
@@ -61,4 +61,4 @@ namespace VRM10.MToon10
         }
     }
 }
-#endif
\ No newline at end of file
+#endif