diff --git a/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterEditorGUI.cs b/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterEditorGUI.cs
index 07e0cff36..97df735f5 100644
--- a/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterEditorGUI.cs
+++ b/Assets/VRM10/Editor/ScriptedImporter/VrmScriptedImporterEditorGUI.cs
@@ -117,12 +117,13 @@ namespace UniVRM10
                             case Vrm10FileType.Vrm0:
                                 EditorGUILayout.HelpBox(m_result.Message, m_model != null ? MessageType.Info : MessageType.Warning);
 
-#if VRM_DEVELOP
-                                if (GUILayout.Button("debug export"))
+                                if (VRMShaders.Symbols.VRM_DEVELOP)
                                 {
-                                    File.WriteAllBytes("tmp.vrm", m_result.MigratedBytes);
+                                    if (GUILayout.Button("debug export"))
+                                    {
+                                        File.WriteAllBytes("tmp.vrm", m_result.MigratedBytes);
+                                    }
                                 }
-#endif
 
                                 // migration check boxs
                                 base.OnInspectorGUI();
diff --git a/Assets/VRM10/Runtime/IO/Vrm10Data.cs b/Assets/VRM10/Runtime/IO/Vrm10Data.cs
index 9dc63571f..b5fffaec1 100644
--- a/Assets/VRM10/Runtime/IO/Vrm10Data.cs
+++ b/Assets/VRM10/Runtime/IO/Vrm10Data.cs
@@ -120,10 +120,13 @@ namespace UniVRM10
                         throw new NullReferenceException("oldMeta");
                     }
                     result = new Vrm10Data(migratedData, vrm, Vrm10FileType.Vrm0, "vrm0: migrated", oldMeta);
-#if VRM_DEVELOP            
-                    // 右手左手座標変換でバッファが破壊的変更されるので、コピーを作っている        
-                    result.MigratedBytes = migrated.Select(x => x).ToArray();
-#endif
+
+                    if (VRMShaders.Symbols.VRM_DEVELOP)
+                    {
+                        // 右手左手座標変換でバッファが破壊的変更されるので、コピーを作っている        
+                        result.MigratedBytes = migrated.Select(x => x).ToArray();
+                    }
+
                     return true;
                 }
 
diff --git a/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs b/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs
new file mode 100644
index 000000000..7035e055e
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs
@@ -0,0 +1,18 @@
+namespace VRMShaders
+{
+    public static class Symbols
+    {
+        /// <summary>
+        /// #if 文を局所化する。
+        /// VRMShaders が最下層になるため、ここに配置している
+        /// </summary>
+        /// <value></value>
+        public const bool VRM_DEVELOP =
+#if VRM_DEVELOP
+true
+#else
+false
+#endif
+        ;
+    }
+}
diff --git a/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs.meta b/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs.meta
new file mode 100644
index 000000000..d60f2fbd2
--- /dev/null
+++ b/Assets/VRMShaders/GLTF/IO/Runtime/Util/Symbols.cs.meta
@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: ffb4175afef01ea48ad7669a8b12d93f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: