diff --git a/install.sh b/install.sh
index 2b8632a8b9e4a81a61627723ef5abde9338af483..dafa3024ea69a6db512ec0db2a6f6a1b76bb7c4d 100644
--- a/install.sh
+++ b/install.sh
@@ -49,7 +49,7 @@ systemctl enable mariadb
 pip install storm
 
 # Install PHP
-yum install php php-fpm php-apc php-pdo php-mcrypt
+yum install php php-fpm php-apc php-pdo php-mcrypt php-mbstring
 cp php-fpm-www.conf /etc/php-fpm.d/www.conf
 systemctl enable php-fpm