diff --git a/roundcubemail/Dockerfile b/roundcubemail/Dockerfile
index 3a1a09c..c8a26ea 100644
--- a/roundcubemail/Dockerfile
+++ b/roundcubemail/Dockerfile
@@ -15,6 +15,7 @@ RUN set -ex; \
 		php-imagick \
 		php-cli \
 		php-mbstring \
+		php-xml \
 		apache2 \
 		libapache2-mod-php \
 		rsync \