1 files changed, 2 insertions, 3 deletions

diff --git a/src/WixToolset.Core/IPreprocessor.cs b/src/WixToolset.Core/IPreprocessor.cs
index d892399c..151f8111 100644
--- a/src/WixToolset.Core/IPreprocessor.cs
+++ b/src/WixToolset.Core/IPreprocessor.cs
@@ -3,13 +3,12 @@
 namespace WixToolset.Core
 {
     using System.Xml;
-    using System.Xml.Linq;
     using WixToolset.Extensibility.Data;
 
     public interface IPreprocessor
     {
-        XDocument Preprocess(IPreprocessContext context);
+        IPreprocessResult Preprocess(IPreprocessContext context);
 
-        XDocument Preprocess(IPreprocessContext context, XmlReader reader);
+        IPreprocessResult Preprocess(IPreprocessContext context, XmlReader reader);
     }
 }