diff --git a/.travis.yml b/.travis.yml
index 010bc9c..d38b1f1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ before_cache:
   # Save tagged docker images see https://github.com/travis-ci/travis-ci/issues/5358#issuecomment-248915326
   - >
     mkdir -p $HOME/docker && docker images -a --filter='dangling=false' --format '{{.Repository}}:{{.Tag}} {{.ID}}'
+    | grep 'wups-loader-builder'
     | xargs -n 2 -t sh -c 'test -e $HOME/docker/$1.tar.gz || docker save $0 | gzip -2 > $HOME/docker/$1.tar.gz'
 
 cache: