diff --git a/prebuild.xml b/prebuild.xml
index b376e86a73..af8f686b79 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -872,6 +872,7 @@
       <Reference name="OpenSim.Capabilities"/>
       <Reference name="OpenSim.Framework.Communications"/>
       <Reference name="OpenSim.Framework.Console"/>
+      <Reference name="OpenSim.Framework.Servers.HttpServer"/>
       <Reference name="OpenSim.Region.Framework"/>
       <Reference name="OpenSim.Server.Base"/>
       <Reference name="OpenSim.Services.Base"/>