diff --git a/SparkleLib/SparkleLib.csproj b/SparkleLib/SparkleLib.csproj
index 211a786a..0f9000da 100755
--- a/SparkleLib/SparkleLib.csproj
+++ b/SparkleLib/SparkleLib.csproj
@@ -31,6 +31,7 @@
   <ItemGroup>
     <Reference Include="System" />
     <Reference Include="Mono.Posix" />
+    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <Compile Include="SparkleRepoBase.cs" />