diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 3e55ecd7d56eb5935c1c3bc61596e5f18c6e4fad..998dd9d98d47219231c8b17059cc7abe8ed03b15 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -18,7 +18,7 @@ pages:
   stage: deploy
   script:
     - cp -r site .public
-    - sed -ei "s/%DATE%/$(date +'%Y-%m-%d %H:%M')/g" .public/index.html
+    - sed -i -e "s/%BUILDDATE%/$(date +'%Y-%m-%d %H:%M')/g" .public/index.html
     - cp build/safelinks-cleaner-thunderbird.xpi .public
     - cp build/safelinks-cleaner-firefox.xpi .public
     - mv .public public