diff --git a/prebuild.xml b/prebuild.xml
index 220c008db7..dff54a3e9e 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -3138,6 +3138,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Xml"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Framework.Communications"/>
       <Reference name="OpenSim.Region.CoreModules"/>