diff --git a/Dockerfile b/Dockerfile
index cfb6f7d..21de7f7 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,7 +4,7 @@ LABEL version="1.1" \
       description="echo client IP details"
 COPY . /var/www/echoIP
 ADD ./conf/docker/init.sh /
-RUN apk --update add --no-cache nginx curl nodejs php7 php7-fpm php7-json php7-iconv php7-sqlite3 php7-openssl && \
+RUN apk --update add --no-cache nginx curl nodejs php7 php7-fpm php7-json php7-iconv php7-sqlite3 php7-openssl php7-mbstring && \
     mkdir /run/nginx && touch /run/nginx/nginx.pid && \
     cp /var/www/echoIP/conf/nginx/docker.conf /etc/nginx/conf.d && \
     cp /var/www/echoIP/conf/docker/init.sh / && \