diff --git a/build/docker_install.sh b/build/docker_install.sh
index 7dca9c3f..df5633ea 100644
--- a/build/docker_install.sh
+++ b/build/docker_install.sh
@@ -20,4 +20,5 @@ chmod +x /usr/local/bin/phpunit
 docker-php-ext-configure gd --enable-gd-native-ttf --with-jpeg-dir=/usr/lib/x86_64-linux-gnu --with-png-dir=/usr/lib/x86_64-linux-gnu --with-freetype-dir=/usr/lib/x86_64-linux-gnu
 docker-php-ext-install gd
 docker-php-ext-install mcrypt
+docker-php-ext-install xsl
 docker-php-ext-install zip
\ No newline at end of file