diff --git a/.nant/local.include b/.nant/local.include
index 7d1681011b..6d3e97228f 100644
--- a/.nant/local.include
+++ b/.nant/local.include
@@ -8,6 +8,24 @@
   <copy file="bin/OpenSim.ini.example" tofile="bin/OpenSim.ini"/>
   <copy file="bin/config-include/StandaloneCommon.ini.example" tofile="bin/config-include/StandaloneCommon.ini"/>
   <copy file="bin/config-include/FlotsamCache.ini.example" tofile="bin/config-include/FlotsamCache.ini"/>
+  <!-- delete files generated by runprebuild.sh which had to be run in order to generate the build file for this target-->
+  <delete>
+    <fileset basedir="OpenSim">
+      <include name="**/*.build"/>
+      <include name="**/*.csproj*"/>
+      <include name="**/*.dll.build"/>
+      <include name="**/*.pidb"/>
+      <exclude name="Tools/OpenSim.32BitLaunch/**"/>
+      <exclude name="Tools/Robust.32BitLaunch/**"/>
+      <exclude name="Tools/LaunchSLClient/**"/>
+    </fileset>
+  </delete>
+  <delete>
+    <fileset>
+      <include name="OpenSim.build"/>
+      <include name="OpenSim.sln"/>
+    </fileset>
+  </delete>
 </target>
 
 <property name="distbindir" value="distbin" />