diff --git a/prebuild.xml b/prebuild.xml
index b494d3a85f..404760f248 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1770,6 +1770,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="Mono.Addins" path="../../../bin/"/>
       <Reference name="OpenMetaverseTypes" path="../../../bin/"/>
@@ -2034,6 +2035,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Data"/>
       <Reference name="OpenSim.Capabilities"/>
@@ -2392,6 +2394,7 @@
 
       <ReferencePath>../../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Data"/>
       <Reference name="System.Web"/>
       <Reference name="System.Xml"/>