diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 90e3c6c..39892cf 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -8,8 +8,8 @@ cache:
 test:
   script:
     - stack build
-    - stack exec site clean
-    - stack exec site build
+    - LC_ALL=C.UTF-8 stack exec site clean
+    - LC_ALL=C.UTF-8 stack exec site build
 
 deploy:
   before_script: