diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 0beed1991dd2f5697a3583f97124d41c8e7e3379..5fe8e0d9cc69cd1166f05729c49ab6ee4ef59360 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -58,6 +58,7 @@ pages:
   before_script:
     - cp -r .tox/screenshots/firefox docs/screenshots
   script:
+    - export LC_ALL=en_GB.utf8
     - tox -e docs -- BUILDDIR=../public/docs
   artifacts:
     paths: