diff --git a/jar/plugin.jelly b/jar/plugin.jelly
index 37f23217..bf9d80aa 100644
--- a/jar/plugin.jelly
+++ b/jar/plugin.jelly
@@ -29,6 +29,7 @@
     <ant:jar
       jarfile="${maven.build.dir}/${maven.final.name}.jar"
       basedir="${maven.build.dest}"
+      index="true"
       excludes="${maven.jar.excludes}"> 
       
       <j:if test="${maven.jar.manifest.available}">