diff --git a/build/docker_install.sh b/build/docker_install.sh
index 6df1353..7482060 100644
--- a/build/docker_install.sh
+++ b/build/docker_install.sh
@@ -7,13 +7,13 @@ set -xe
 
 # Install git (the php image doesn't have it) which is required by composer
 echo -e 'http://dl-cdn.alpinelinux.org/alpine/edge/main\nhttp://dl-cdn.alpinelinux.org/alpine/edge/community\nhttp://dl-cdn.alpinelinux.org/alpine/edge/testing' > /etc/apk/repositories
-apk upgrade --update && apk add --no-cache \
+apk upgrade --update --no-cache \
 	g++ \
 	make \
 	automake \
 	curl \
 	git \
-	libmemcached
+	libmemcached-dev
 	
 docker-php-source extract
 pecl install apcu-5.1.8