diff --git a/libsecondlife-cs/libsecondlife.build b/libsecondlife-cs/libsecondlife.build
index f6d1099e..a3957fe1 100644
--- a/libsecondlife-cs/libsecondlife.build
+++ b/libsecondlife-cs/libsecondlife.build
@@ -55,7 +55,7 @@
                 <include name="mapgenerator/ProtocolManager.cs" />
             </sources>
         </csc>
-        <exec program="../bin/mapgenerator.exe" output="_Packets_.cs">
+        <exec program="../bin/mapgenerator.exe" output="_Packets_.cs" useruntimeengine="true">
             <arg line="../data/keywords.txt ../data/message_template.msg mapgenerator/template.cs _Packets_.cs" />
         </exec>
     </target>