diff --git a/bin/OpenMetaverse.dll b/bin/OpenMetaverse.dll
index 6ec1b1c91f..3f9255e9e7 100644
Binary files a/bin/OpenMetaverse.dll and b/bin/OpenMetaverse.dll differ
diff --git a/prebuild.xml b/prebuild.xml
index d2d1e6d9fa..640d530064 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -747,6 +747,7 @@
 
       <ReferencePath>../../../bin/</ReferencePath>
       <Reference name="System"/>
+      <Reference name="System.Core"/>
       <Reference name="System.Xml"/>
       <Reference name="System.Drawing"/>
       <Reference name="System.Web"/>