diff --git a/Assets/UniGLTF/Editor/EditorSettingsValidator/UnityEditorSettingsValidatorWindow.cs b/Assets/UniGLTF/Editor/EditorSettingsValidator/UnityEditorSettingsValidatorWindow.cs
index f7fce289f..5b5b2caa9 100644
--- a/Assets/UniGLTF/Editor/EditorSettingsValidator/UnityEditorSettingsValidatorWindow.cs
+++ b/Assets/UniGLTF/Editor/EditorSettingsValidator/UnityEditorSettingsValidatorWindow.cs
@@ -3,6 +3,7 @@ using UniGLTF.M17N;
 using UnityEditor;
 using UnityEngine;
 
+#if ! VRM_USE_GAMMA
 namespace UniGLTF.EditorSettingsValidator
 {
     [InitializeOnLoad]
@@ -95,4 +96,5 @@ namespace UniGLTF.EditorSettingsValidator
             }
         }
     }
-}
\ No newline at end of file
+}
+#endif
\ No newline at end of file