diff --git a/prebuild.xml b/prebuild.xml
index 4158ed1359..9b8154241b 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1407,6 +1407,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>
@@ -2405,6 +2406,7 @@
 
       <ReferencePath>../../../../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Data"/>
       <Reference name="System.Web"/>
       <Reference name="System.Xml"/>