diff --git a/prebuild.xml b/prebuild.xml
index f55ba3189b..42b5a39fc1 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -170,6 +170,7 @@
 
       <ReferencePath>../../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Xml" localCopy="false"/>
       <Reference name="OpenSim.Framework.Console"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="libsecondlife.dll"/>
@@ -1022,6 +1023,7 @@
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System" localCopy="false"/>
       <Reference name="System.Data" localCopy="false"/>
+      <Reference name="System.Xml" localCopy="false"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Framework.AssetLoader.Filesystem"/>
       <Reference name="OpenSim.Framework.Console"/>