diff --git a/java/plugin.jelly b/java/plugin.jelly
index f1f981c1..bd2f01a6 100644
--- a/java/plugin.jelly
+++ b/java/plugin.jelly
@@ -255,7 +255,7 @@
       artifact="${relativePath}"
       type="jars"
       assureDirectoryCommand="mkdir -p"
-      siteCommand="cd @deployDirectory@; chmod g+w ${maven.jar.to.deploy}"
+      siteCommand="cd @deployDirectory@; chmod g+w ${maven.jar.to.deploy}; chgrp maven ${maven.jar.to.deploy}"
     />
 
   </goal>