diff --git a/lib/gulp_docker/docker.coffee b/lib/gulp_docker/docker.coffee
index f644a5e..680468b 100644
--- a/lib/gulp_docker/docker.coffee
+++ b/lib/gulp_docker/docker.coffee
@@ -62,7 +62,7 @@ module.exports = (GulpDocker) ->
 
       if push
         for container in containers
-          container.push = push
+          container.push = (push === 'true')
 
         Promise.resolve(containers)
       else