diff --git a/php/Dockerfile b/php/Dockerfile
index fd3dcaa..b0b129e 100644
--- a/php/Dockerfile
+++ b/php/Dockerfile
@@ -97,6 +97,9 @@ opcache.fast_shutdown=1\n\
 opcache.enable_cli=1\n\
 opcache.enable=1\n" > /usr/local/etc/php/conf.d/opcache.ini
 
+RUN apk add --no-cache --repository http://dl-3.alpinelinux.org/alpine/edge/testing gnu-libiconv
+ENV LD_PRELOAD /usr/lib/preloadable_libiconv.so php
+
 ENV PHP_REDIS_VERSION 5.1.1
 RUN git clone --branch ${PHP_REDIS_VERSION} https://github.com/phpredis/phpredis /tmp/phpredis \
         && cd /tmp/phpredis \