diff --git a/Scripts/SpringBone/VRMSpringBone.cs b/Scripts/SpringBone/VRMSpringBone.cs
index 6143b4f49..210bd3915 100644
--- a/Scripts/SpringBone/VRMSpringBone.cs
+++ b/Scripts/SpringBone/VRMSpringBone.cs
@@ -1,7 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using UnityEngine;
-
+using UniGLTF;
 
 namespace VRM
 {