diff --git a/docker/shadowsocks-libev/Dockerfile b/docker/shadowsocks-libev/Dockerfile
index 3840359..bda6660 100644
--- a/docker/shadowsocks-libev/Dockerfile
+++ b/docker/shadowsocks-libev/Dockerfile
@@ -6,10 +6,10 @@
 FROM debian:stretch
 MAINTAINER Teddysun <i@teddysun.com>
 
-RUN set -ex; \
-    && printf "deb http://deb.debian.org/debian stretch-backports main" > /etc/apt/sources.list.d/stretch-backports.list; \
-    && apt-get update; \
-    && apt-get -t stretch-backports install -y --no-install-recommends shadowsocks-libev simple-obfs; \
+RUN set -ex \
+    && printf "deb http://deb.debian.org/debian stretch-backports main" > /etc/apt/sources.list.d/stretch-backports.list \
+    && apt-get update \
+    && apt-get -t stretch-backports install -y --no-install-recommends shadowsocks-libev simple-obfs \
     && rm -rf /var/lib/apt/lists/*
 
 COPY ./config_sample.json /etc/shadowsocks-libev/config.json
diff --git a/docker/shadowsocks-r/Dockerfile b/docker/shadowsocks-r/Dockerfile
index a8547f7..f688544 100644
--- a/docker/shadowsocks-r/Dockerfile
+++ b/docker/shadowsocks-r/Dockerfile
@@ -6,14 +6,14 @@
 FROM debian:stretch
 MAINTAINER Teddysun <i@teddysun.com>
 
-RUN set -ex; \
-    && apt-get update; \
-    && apt-get install -y wget python libsodium-dev openssl; \
-    && rm -rf /var/lib/apt/lists/*; \
-    && wget -O /tmp/shadowsocksr-3.2.2.tar.gz https://github.com/shadowsocksrr/shadowsocksr/archive/3.2.2.tar.gz; \
-    && tar zxf /tmp/shadowsocksr-3.2.2.tar.gz -C /tmp; \
-    && mv /tmp/shadowsocksr-3.2.2/shadowsocks /usr/local/; \
-    && rm -fr /tmp/shadowsocksr-3.2.2; \
+RUN set -ex \
+    && apt-get update \
+    && apt-get install -y wget python libsodium-dev openssl \
+    && rm -rf /var/lib/apt/lists/* \
+    && wget -O /tmp/shadowsocksr-3.2.2.tar.gz https://github.com/shadowsocksrr/shadowsocksr/archive/3.2.2.tar.gz \
+    && tar zxf /tmp/shadowsocksr-3.2.2.tar.gz -C /tmp \
+    && mv /tmp/shadowsocksr-3.2.2/shadowsocks /usr/local/ \
+    && rm -fr /tmp/shadowsocksr-3.2.2 \
     && rm -f /tmp/shadowsocksr-3.2.2.tar.gz
 
 COPY ./config_sample.json /etc/shadowsocks-r/config.json