diff --git a/.travis.yml b/.travis.yml
index 96fc9ade..d1223646 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -20,7 +20,7 @@ script:
     - sh contrib/ci.sh
 
 after_success:
-    - if [ ! -s "$TRAVIS_TAG" ] ; then 
+    - if [ ! -z "$TRAVIS_TAG" ] ; then 
         docker tag $DOCKER_NS/gateway:latest-dev $DOCKER_NS/gateway:$TRAVIS_TAG;
         docker login -u=$DOCKER_USERNAME -p=$DOCKER_PASSWORD;
         docker push $DOCKER_NS/gateway:$TRAVIS_TAG;