diff --git a/prebuild.xml b/prebuild.xml
index 0c28e2b88b..307e40be88 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -675,7 +675,7 @@
       <Reference name="OpenSim.Framework.Console"/>
       <Reference name="OpenSim.Region.Physics.Manager"/>
       <Reference name="OpenSim.Framework.Servers"/>
-      <Reference name="OpenSim.Framework.RegionLoader.FileSystem"/>
+      <Reference name="OpenSim.Framework.RegionLoader.Filesystem"/>
       <Reference name="OpenSim.Framework.RegionLoader.Web"/>
       <Reference name="OpenSim.Region.Environment"/>
       <Reference name="OpenSim.Region.ClientStack"/>