diff --git a/OpenSimProfile/prebuild.xml b/OpenSimProfile/prebuild.xml
index 230699f..4aeaa36 100644
--- a/OpenSimProfile/prebuild.xml
+++ b/OpenSimProfile/prebuild.xml
@@ -26,6 +26,8 @@
     <Reference name="Mono.Addins"/>
 
     <Files>
-      <Match pattern="*.cs" recurse="true"/>
+      <Match pattern="*.cs" recurse="true">
+        <Exclude name="obj" pattern="obj"/>
+      </Match>
     </Files>
 </Project>