diff --git a/test/Docfx.Build.Tests/XRefMapSerializationTest.cs b/test/Docfx.Build.Tests/XRefMapSerializationTest.cs
index 8ab4489200b..afae124e4ae 100644
--- a/test/Docfx.Build.Tests/XRefMapSerializationTest.cs
+++ b/test/Docfx.Build.Tests/XRefMapSerializationTest.cs
@@ -3,7 +3,6 @@
 
 using System.Text;
 using Docfx.Common;
-using Docfx.Plugins;
 using FluentAssertions;
 using Xunit;