diff --git a/prebuild.xml b/prebuild.xml
index 4f04032e2a..a8b735ccf4 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1230,6 +1230,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="OpenMetaverseTypes" path="../../../bin/"/>
       <Reference name="OpenMetaverse" path="../../../bin/"/>