diff --git a/.nant/bamboo.build b/.nant/bamboo.build
index 1eb4750656..6e98dc452b 100644
--- a/.nant/bamboo.build
+++ b/.nant/bamboo.build
@@ -6,7 +6,7 @@
 	</target>
 	<target name="cibuild">
 			<property name="projectdir" value="opensim-0.5.5" />
-			<exec program="mono" commandline="../bin/Prebuild.exe /target nant" />
+			<exec program="mono" commandline="../bin/Prebuild.exe /target nant" workingdir="../" />
 	        <nant buildfile="../OpenSim.build" target="build" />
 
 		   <delete dir="../${projectdir}" />