diff --git a/build.xml b/build.xml
index 034cf5a6e..846515257 100644
--- a/build.xml
+++ b/build.xml
@@ -95,6 +95,7 @@
 
 <target name="buildSvnRevNr">
   <delete file="lib/svnRevNr.jar" />
+  <javac srcdir="${lib}/svnRevNr" />
   <jar destfile="lib/svnRevNr.jar" basedir="${lib}/svnRevNr">
     <manifest>
       <attribute name="Main-Class" value="svnRevNrParser"/>