diff --git a/prebuild.xml b/prebuild.xml
index 5da8d9c0c4..33267e24a9 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -121,7 +121,7 @@
       <Reference name="System"/>
       <Reference name="System.Xml"/>
       <Reference name="log4net.dll"/>
-      <Reference name="OpenMetaverse" />
+      <Reference name="OpenMetaverse.dll" />
       <Reference name="OpenSim.Framework"/>
 
       <Files>