diff --git a/builder/image-ros.sh b/builder/image-ros.sh
index 493a2616..25ff5101 100755
--- a/builder/image-ros.sh
+++ b/builder/image-ros.sh
@@ -131,6 +131,7 @@ gitbook build
 # replace assets copy to assets symlink to save space
 rm -rf _book/assets && ln -s ../docs/assets _book/assets
 touch node_modules/CATKIN_IGNORE docs/CATKIN_IGNORE _book/CATKIN_IGNORE clover/www/CATKIN_IGNORE apps/CATKIN_IGNORE # ignore documentation files by catkin
+npm cache clean --force
 
 echo_stamp "Installing additional ROS packages"
 my_travis_retry apt-get install -y --no-install-recommends \