diff --git a/prebuild.xml b/prebuild.xml
index 15b29a7dab..c6604d3763 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -2056,9 +2056,10 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
-      <Reference name="System.Xml"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Data"/>
       <Reference name="System.Drawing"/>
+      <Reference name="System.Xml"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Data"/>
       <Reference name="OpenMetaverseTypes" path="../../../bin/"/>