diff --git a/Assets/YooAsset/Editor/AssetBundleBuilder/BuildBundleInfo.cs b/Assets/YooAsset/Editor/AssetBundleBuilder/BuildBundleInfo.cs
index 994bae9..cbe2245 100644
--- a/Assets/YooAsset/Editor/AssetBundleBuilder/BuildBundleInfo.cs
+++ b/Assets/YooAsset/Editor/AssetBundleBuilder/BuildBundleInfo.cs
@@ -56,7 +56,11 @@ namespace YooAsset.Editor
         public string EncryptedFilePath { set; get; }
         #endregion
 
+#if UNITY_2020_3_OR_NEWER
         private readonly HashSet<string> _assetPaths = new HashSet<string>(1000);
+#else
+        private readonly HashSet<string> _assetPaths = new HashSet<string>();
+#endif
 
         /// <summary>
         /// 参与构建的资源列表