diff --git a/build/docker_install.sh b/build/docker_install.sh
index 7482060..18fa5a9 100644
--- a/build/docker_install.sh
+++ b/build/docker_install.sh
@@ -15,6 +15,8 @@ apk upgrade --update --no-cache \
 	git \
 	libmemcached-dev
 	
+echo 'apcu memcached' >> /usr/src/php-available-exts
+	
 docker-php-source extract
 pecl install apcu-5.1.8 
 pecl install memcached-3.0.3