diff --git a/contrib/ci/Dockerfile-arch.in b/contrib/ci/Dockerfile-arch.in
index 906492e7f..e30765d2a 100644
--- a/contrib/ci/Dockerfile-arch.in
+++ b/contrib/ci/Dockerfile-arch.in
@@ -4,6 +4,9 @@ ENV LANG en_US.UTF-8
 ENV LC_ALL en_US.UTF-8
 ENV CI_NETWORK true
 RUN echo fubar > /etc/machine-id
+RUN sed "s,#en_US.UTF-8,en_US.UTF-8," /etc/locale.gen -i
+RUN echo "LANG=en_US.UTF-8" > /etc/locale.conf
+RUN locale-gen
 RUN pacman -Syu --noconfirm archlinux-keyring
 %%%INSTALL_DEPENDENCIES_COMMAND%%%
 WORKDIR /github/workspace