diff --git a/Dockerfile b/Dockerfile
index 3156f7b..c3d09fe 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -11,7 +11,7 @@ VOLUME /config
 RUN echo "http://dl-4.alpinelinux.org/alpine/edge/community/" >> /etc/apk/repositories \
     && echo "http://dl-4.alpinelinux.org/alpine/edge/testing/" >> /etc/apk/repositories \
     && apk add --update bash openvpn iptables shadow boost-system boost-thread ca-certificates unrar findutils perl gawk pacman \
-    && yesterdays_date=$(date -d "yesterday" +%Y/%m/%d) \
+    && yesterdays_date=$(date --date="-1 days ago" +%Y/%m/%d) \
     && echo 'Server = https://archive.archlinux.org/repos/'"${yesterdays_date}"'/$repo/os/$arch' > /etc/pacman.d/mirrorlist \
     && echo 'Server = http://archive.virtapi.org/repos/'"${yesterdays_date}"'/$repo/os/$arch' >> /etc/pacman.d/mirrorlist \
     && rm -rf /etc/pacman.d/gnupg/ /root/.gnupg/ || true \