diff --git a/prebuild.xml b/prebuild.xml
index 1f7ff6ee9e..a62735bc4b 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -195,7 +195,7 @@
       <Reference name="Db4objects.Db4o.dll"/>
       <Reference name="libsecondlife.dll"/>
       <Reference name="OpenSim.Framework"/>
-      <Reference name="OpenSim.Region.Enviroment"/>
+      <Reference name="OpenSim.Region.Environment"/>
       <Reference name="OpenSim.Framework.Console"/>
       <Files>
         <Match pattern="*.cs" recurse="true"/>