diff --git a/Apewer/Source/SourceUtility.cs b/Apewer/Source/SourceUtility.cs
index fb6adf1..c0ae115 100644
--- a/Apewer/Source/SourceUtility.cs
+++ b/Apewer/Source/SourceUtility.cs
@@ -1615,7 +1615,7 @@ namespace Apewer.Source
 
         #region Dynamic
 
-#if NET40_OR_GREATER
+#if !NET20
 
         /// <summary>转换 ObjectSet 数组为 dynamic 数组。</summary>
         public static dynamic[] Dynamic(this ObjectSet[] oss)