diff --git a/test/Dockerfile b/test/Dockerfile
index 22ac05393c30794a0727177e75ac5276c370abed..5a2b29e19ccca91a161a37b4d4b6a3ca9c0ea5e0 100644
--- a/test/Dockerfile
+++ b/test/Dockerfile
@@ -16,6 +16,7 @@ RUN mkdir -p /var/log/journal/
 RUN echo "C UTF-8\nfr_FR UTF-8" >/etc/locale.gen \
   && locale-gen \
   && update-locale LANG=fr_FR.UTF-8
+ENV LANG=fr_FR.UTF-8
 
 STOPSIGNAL SIGRTMIN+3
 #CMD ["/sbin/init", "--log-target=console", "--default-standard-output=tty", "--default-standard-error=tty"]