diff --git a/resources/install/build.xml b/resources/install/build.xml
index d99c0a10d..c388569fd 100644
--- a/resources/install/build.xml
+++ b/resources/install/build.xml
@@ -296,7 +296,7 @@
         <zip destfile="${windows.app.dir}/${package.name}-${sip-communicator.version}-windows.zip"
                 basedir="${windows.app.dir}/tmp"/>
 
-        <!--exec dir="${windows.app.dir}/tmp" executable="${7zip.executable}" failifexecutionfails="false">
+        <exec dir="${windows.app.dir}/tmp" executable="${7zip.executable}" failifexecutionfails="false">
             <arg line="a -y data.7z *"/>
         </exec>
 
@@ -317,7 +317,7 @@
             <fileset dir="${windows.app.dir}/tmp">
                 <include name="data.7z"/>
             </fileset>
-      </concat-->
+      </concat>
 
         <!-- Delete the temp directory-->
         <delete dir="${windows.app.dir}/tmp"/>