diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
index 6cdbecb..e05de67 100644
--- a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
@@ -57,7 +57,7 @@ public override void OnGUI (Rect position, SerializedProperty property, GUIConte
 					Rect foldoutRect = new Rect(position);
 					foldoutRect.height = EditorGUIUtility.singleLineHeight;
 
-#if UNITY_2022_2_OR_NEWER
+#if UNITY_2022_2
 					// NOTE: Position x must be adjusted.
 					// FIXME: Is there a more essential solution...?
 					foldoutRect.x -= 12;
@@ -199,4 +199,4 @@ public override float GetPropertyHeight (SerializedProperty property,GUIContent
 
 	}
 }
-#endif
\ No newline at end of file
+#endif