diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 344ed80a..d7313605 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,6 +1,6 @@
 variables:
   DEBIAN_FRONTEND: noninteractive
-  LC_ALL: C
+  LC_ALL: C.UTF-8
   GIT_STRATEGY: fetch
   DOCKER_CMD: docker --config="$HOME/.docker/$CI_JOB_ID/"
   IMG_BASE: registry.labs.nic.cz/labs/bird