diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 5869ad4b0c97ebe457a445e66f94c97080b23f87..e88251b0657aa430b90ac12e53bfe95eb6b312b0 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -29,7 +29,7 @@ deploy:
   image: python:latest
   script:
   - pip install s3cmd 
-  - s3cmd put ./build/css/ s3://srct/masonstrap/ --recursive --host='nyc3.digitaloceanspaces.com' --host-bucket='%(bucket)s.nyc3.digitaloceanspaces.com' --exclude='*' --include='*.min.css' --acl-public --add-header='content-type':'text/css'
-  - s3cmd put ./build/js/ s3://srct/masonstrap/ --recursive --host='nyc3.digitaloceanspaces.com' --host-bucket='%(bucket)s.nyc3.digitaloceanspaces.com' --exclude='*' --include='*.min.js' --acl-public --add-header='content-type':'application/javascript'
+  - s3cmd put ./build/css/ s3://srct/masonstrap/ --recursive --host='nyc3.digitaloceanspaces.com' --host-bucket='%(bucket)s.nyc3.digitaloceanspaces.com' --exclude='*' --include='*.min.css' --acl-public -m 'text/css'
+  - s3cmd put ./build/js/ s3://srct/masonstrap/ --recursive --host='nyc3.digitaloceanspaces.com' --host-bucket='%(bucket)s.nyc3.digitaloceanspaces.com' --exclude='*' --include='*.min.js' --acl-public -m 'application/javascript'
   only:
   - master