diff --git a/prebuild.xml b/prebuild.xml
index 96e5ae1315..c215ba1480 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -2053,6 +2053,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Data"/>
       <Reference name="System.Drawing"/>