diff --git a/config/app-install.sh b/config/app-install.sh
index 4bb8808..ec39263 100644
--- a/config/app-install.sh
+++ b/config/app-install.sh
@@ -13,7 +13,7 @@
     mkdir -p $APP_INSTALL_ROOT
     cd $APP_INSTALL_ROOT
     cp $oar $APP_INSTALL_ROOT
-    jar -xf $APP_INSTALL_ROOT/$(basename $oar)
+    unzip -oq -d . $APP_INSTALL_ROOT/$(basename $oar)
     name=$(grep "name=" $APP_INSTALL_ROOT/app.xml | sed 's/<app name="//g;s/".*//g')
     mkdir -p $APPS_ROOT/$name
     cp $APP_INSTALL_ROOT/app.xml $APPS_ROOT/$name/app.xml