build.xml.diff

diff --git a/build.xml b/build.xml
index e2d57e3..790456f 100644
--- a/build.xml
+++ b/build.xml
@@ -396,11 +396,7 @@
   <target name="-assemble-native-jar" depends="-init-vars, -build-platform-jar">
     <jar jarfile="${native.jar}" index="true" update="true" duplicate="preserve"
          filesetmanifest="skip">
-      <archives>
-        <zips>
-          <fileset dir="archive" includes="jffi-*.jar"/>
-        </zips>
-      </archives>
+      <zipgroupfileset dir="archive" includes="jffi-*.jar"/>
       <zipfileset src="${dist.dir}/jffi-${platform}.jar"/>
     </jar>
   </target>