diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 01abb84..3f77f19 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -44,7 +44,7 @@ pages:
     # simulate the drive being inserted
     - mv simulated-usb-butter usb-butter
     - "sed -i 's/^baseurl.*/baseurl: \"\\/butter-box-ui\"/' _config.yml"
-    - "sed -I 's/^usb_butter_url.*/usb_butter_url: \"\\/butter-box-ui\\/usb-butter\\/\"/' _config.yml"
+    - "sed -i 's/^usb_butter_url.*/usb_butter_url: \"\\/butter-box-ui\\/usb-butter\\/\"/' _config.yml"
     - bundle exec jekyll build -d public
     # Now move the zip into the public dir so it gets served.
     - mv ./site-en.zip ./public/site-en.zip