diff --git a/OpenSim/Region/Communications/Hypergrid/HGCommunicationsGridMode.cs b/OpenSim/Region/Communications/Hypergrid/HGCommunicationsGridMode.cs
index 126823736f..feacb2f6c5 100644
--- a/OpenSim/Region/Communications/Hypergrid/HGCommunicationsGridMode.cs
+++ b/OpenSim/Region/Communications/Hypergrid/HGCommunicationsGridMode.cs
@@ -27,6 +27,7 @@
 
 using System.Reflection;
 using log4net;
+using OpenSim.Data;
 using OpenSim.Framework;
 using OpenSim.Framework.Communications;
 using OpenSim.Framework.Communications.Cache;
diff --git a/prebuild.xml b/prebuild.xml
index 33b68f8cca..56cf5a7fcb 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1304,6 +1304,7 @@
       <Reference name="System.Drawing"/>
       <Reference name="System.Runtime.Remoting"/>
       <Reference name="System.Xml"/>
+      <Reference name="OpenSim.Data"/>
       <Reference name="OpenSim.Framework"/>
       <Reference name="OpenSim.Framework.Communications" />
       <Reference name="OpenSim.Framework.Servers"/>