diff --git a/pica-dokuwiki/Dockerfile b/pica-dokuwiki/Dockerfile
index d8e10dd718c5b1bd3f7c89ffeab741d35010c880..e36fd2f4c07a1442f5d42379c2e3efb4e2d99826 100644
--- a/pica-dokuwiki/Dockerfile
+++ b/pica-dokuwiki/Dockerfile
@@ -12,7 +12,8 @@ RUN apt-get update -y && \
         php7.0 \
         php7.0-fpm \
         php7.0-gd \
-        php7.0-xml && \
+        php7.0-xml \
+        libidn2-0 && \
     mkdir -p html /var/run/php && \
     echo "cgi.fix_pathinfo = 0;" >> /etc/php/7.0/fpm/php.ini && \
     sed -i -e "s|;daemonize\s*=\s*yes|daemonize = no|g" /etc/php/7.0/fpm/php-fpm.conf && \