diff --git a/prebuild.xml b/prebuild.xml
index 94c83f7db1..91dfd1ec19 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1377,6 +1377,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>
@@ -1437,6 +1438,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>