diff --git a/prebuild.xml b/prebuild.xml
index 70b5984734..2dd241d97a 100644
--- a/prebuild.xml
+++ b/prebuild.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8" ?>
-<Prebuild version="1.7">
+<Prebuild xmlns="http://dnpb.sourceforge.net/schemas/prebuild-1.7.xsd" version="1.7">
   <Solution name="OpenSim" activeConfig="Debug" path="./" version="0.5.0-$Rev$">
     <Configuration name="Debug">
       <Options>