diff --git a/src/SharpCompress/Compressors/ZStandard/ZstandardConstants.cs b/src/SharpCompress/Compressors/ZStandard/ZstandardConstants.cs
index 8025c658..ac4756d4 100644
--- a/src/SharpCompress/Compressors/ZStandard/ZstandardConstants.cs
+++ b/src/SharpCompress/Compressors/ZStandard/ZstandardConstants.cs
@@ -1,9 +1,3 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
 namespace SharpCompress.Compressors.ZStandard;
 
 internal class ZstandardConstants