diff --git a/pica-dokuwiki/Dockerfile b/pica-dokuwiki/Dockerfile
index 432af4c00b8f0be1e5c8fde93170b21f06515bc2..41407c3149aecda3029c60242db6e00237c7c2da 100644
--- a/pica-dokuwiki/Dockerfile
+++ b/pica-dokuwiki/Dockerfile
@@ -8,6 +8,7 @@ WORKDIR /var/www
 RUN apt-get update -y && \
     apt-get install -y \
         curl \
+        libidn2-0 \
         tar \
         php7.0 \
         php7.0-fpm \