diff --git a/Assets/VRM10/Runtime/FastSpringBone/System/CopyToNativeArrayTransformJob.cs b/Assets/VRM10/Runtime/FastSpringBone/System/CopyToNativeArrayTransformJob.cs
index 9e1d8f8fa..d31ec3326 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/System/CopyToNativeArrayTransformJob.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/System/CopyToNativeArrayTransformJob.cs
@@ -1,11 +1,16 @@
-using Unity.Burst;
 using Unity.Collections;
 using UnityEngine.Jobs;
 using UniVRM10.FastSpringBones.Blittables;
+#if ENABLE_SPRINGBONE_BURST
+using Unity.Burst;
+#endif
 
 namespace UniVRM10.FastSpringBones.System
 {
+
+#if ENABLE_SPRINGBONE_BURST
     [BurstCompile]
+#endif
     public struct PullTransformJob : IJobParallelForTransform
     {
         [WriteOnly] public NativeArray<BlittableTransform> Transforms;
diff --git a/Assets/VRM10/Runtime/FastSpringBone/System/FastSpringBoneSystem.cs b/Assets/VRM10/Runtime/FastSpringBone/System/FastSpringBoneSystem.cs
index eed86eef6..e4df6e851 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/System/FastSpringBoneSystem.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/System/FastSpringBoneSystem.cs
@@ -2,6 +2,7 @@ using UnityEngine;
 
 namespace UniVRM10.FastSpringBones.System
 {
+    [DefaultExecutionOrder(11000)]
     public sealed class FastSpringBoneService : MonoBehaviour
     {
         public FastSpringBoneBufferCombiner BufferCombiner { get; private set; }
diff --git a/Assets/VRM10/Runtime/FastSpringBone/System/PushTransformJob.cs b/Assets/VRM10/Runtime/FastSpringBone/System/PushTransformJob.cs
index 5eaf95420..cc19b6fa2 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/System/PushTransformJob.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/System/PushTransformJob.cs
@@ -1,11 +1,15 @@
-using Unity.Burst;
 using Unity.Collections;
 using UnityEngine.Jobs;
 using UniVRM10.FastSpringBones.Blittables;
+#if ENABLE_SPRINGBONE_BURST
+using Unity.Burst;
+#endif
 
 namespace UniVRM10.FastSpringBones.System
 {
+#if ENABLE_SPRINGBONE_BURST
     [BurstCompile]
+#endif
     public struct PushTransformJob : IJobParallelForTransform
     {
         [ReadOnly]
diff --git a/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs b/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
index 9ab2191cb..b9ae16115 100644
--- a/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
+++ b/Assets/VRM10/Runtime/FastSpringBone/System/UpdateFastSpringBoneJob.cs
@@ -1,12 +1,16 @@
-using Unity.Burst;
 using Unity.Collections;
 using Unity.Jobs;
 using UnityEngine;
 using UniVRM10.FastSpringBones.Blittables;
+#if ENABLE_SPRINGBONE_BURST
+using Unity.Burst;
+#endif
 
 namespace UniVRM10.FastSpringBones.System
 {
+#if ENABLE_SPRINGBONE_BURST
     [BurstCompile]
+#endif
     public struct UpdateFastSpringBoneJob : IJobParallelFor
     {
         [ReadOnly] public NativeArray<BlittableSpring> Springs;