diff --git a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
index 898d199..365ab9a 100644
--- a/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
+++ b/Assets/MackySoft/MackySoft.SerializeReferenceExtensions/Editor/SubclassSelectorDrawer.cs
@@ -56,7 +56,7 @@ namespace MackySoft.SerializeReferenceExtensions.Editor
 					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;
@@ -197,4 +197,4 @@ namespace MackySoft.SerializeReferenceExtensions.Editor
 		}
 
 	}
-}
\ No newline at end of file
+}