diff --git a/docker/1.5/Dockerfile b/docker/1.5/Dockerfile
index 5295ab6a..092b9d61 100644
--- a/docker/1.5/Dockerfile
+++ b/docker/1.5/Dockerfile
@@ -1,20 +1,20 @@
 FROM alpine:3.8
 
 LABEL maintainer="Roger Light <roger@atchoo.org>" \
-	 description="Eclipse Mosquitto MQTT Broker"
+    description="Eclipse Mosquitto MQTT Broker"
 
 ENV VERSION=1.5.3 \
-	 DOWNLOAD_SHA256=3081a998d303a883b1cd064009beabc88aa9159e26f5258a4ae6007160491d10 \
-	 GPG_KEYS=A0D6EEA1DCAE49A635A3B2F0779B22DFB3E717B7 \
-	 LWS_VERSION=2.4.2
+    DOWNLOAD_SHA256=3081a998d303a883b1cd064009beabc88aa9159e26f5258a4ae6007160491d10 \
+    GPG_KEYS=A0D6EEA1DCAE49A635A3B2F0779B22DFB3E717B7 \
+    LWS_VERSION=2.4.2
 
 RUN set -x && \
-	 apk --no-cache add --virtual build-deps \
-      build-base \
-      cmake \
-	  gnupg \
-      libressl-dev \
-      util-linux-dev && \
+    apk --no-cache add --virtual build-deps \
+        build-base \
+        cmake \
+        gnupg \
+        libressl-dev \
+        util-linux-dev && \
     wget https://github.com/warmcat/libwebsockets/archive/v${LWS_VERSION}.tar.gz -O /tmp/lws.tar.gz && \
     mkdir -p /build/lws && \
     tar --strip=1 -xf /tmp/lws.tar.gz -C /build/lws && \
@@ -34,51 +34,51 @@ RUN set -x && \
     make -j "$(nproc)" && \
     rm -rf /root/.cmake && \
     wget https://mosquitto.org/files/source/mosquitto-${VERSION}.tar.gz -O /tmp/mosq.tar.gz && \
-	echo "$DOWNLOAD_SHA256  /tmp/mosq.tar.gz" | sha256sum -c - && \
+    echo "$DOWNLOAD_SHA256  /tmp/mosq.tar.gz" | sha256sum -c - && \
     wget https://mosquitto.org/files/source/mosquitto-${VERSION}.tar.gz.asc -O /tmp/mosq.tar.gz.asc && \
-	export GNUPGHOME="$(mktemp -d)" && \
-	found=''; \
-	for server in \
-		ha.pool.sks-keyservers.net \
-		hkp://keyserver.ubuntu.com:80 \
-		hkp://p80.pool.sks-keyservers.net:80 \
-		pgp.mit.edu \
-	; do \
-		echo "Fetching GPG key $GPG_KEYS from $server"; \
-		gpg --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$GPG_KEYS" && found=yes && break; \
-	done; \
-	test -z "$found" && echo >&2 "error: failed to fetch GPG key $GPG_KEYS" && exit 1; \
-	gpg --batch --verify /tmp/mosq.tar.gz.asc /tmp/mosq.tar.gz && \
-	gpgconf --kill all && \
-	rm -rf "$GNUPGHOME" /tmp/mosq.tar.gz.asc && \
-	mkdir -p /build/mosq && \
-	tar --strip=1 -xf /tmp/mosq.tar.gz -C /build/mosq && \
-	rm /tmp/mosq.tar.gz && \
+    export GNUPGHOME="$(mktemp -d)" && \
+    found=''; \
+    for server in \
+        ha.pool.sks-keyservers.net \
+        hkp://keyserver.ubuntu.com:80 \
+        hkp://p80.pool.sks-keyservers.net:80 \
+        pgp.mit.edu \
+    ; do \
+        echo "Fetching GPG key $GPG_KEYS from $server"; \
+        gpg --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$GPG_KEYS" && found=yes && break; \
+    done; \
+    test -z "$found" && echo >&2 "error: failed to fetch GPG key $GPG_KEYS" && exit 1; \
+    gpg --batch --verify /tmp/mosq.tar.gz.asc /tmp/mosq.tar.gz && \
+    gpgconf --kill all && \
+    rm -rf "$GNUPGHOME" /tmp/mosq.tar.gz.asc && \
+    mkdir -p /build/mosq && \
+    tar --strip=1 -xf /tmp/mosq.tar.gz -C /build/mosq && \
+    rm /tmp/mosq.tar.gz && \
     make -C /build/mosq -j "$(nproc)" \
         CFLAGS="-Wall -O2 -I/build/lws/include -flto" \
         LDFLAGS="-L/build/lws/lib -flto" \
-      WITH_ADNS=no \
-	  WITH_DOCS=no \
-      WITH_MEMORY_TRACKING=no \
-	  WITH_SHARED_LIBRARIES=no \
-      WITH_SRV=no \
-	  WITH_STRIP=yes \
-      WITH_TLS_PSK=no \
-      WITH_WEBSOCKETS=yes \
-      prefix=/usr \
-      binary && \
-	addgroup -S mosquitto 2>/dev/null && \
+        WITH_ADNS=no \
+        WITH_DOCS=no \
+        WITH_MEMORY_TRACKING=no \
+        WITH_SHARED_LIBRARIES=no \
+        WITH_SRV=no \
+        WITH_STRIP=yes \
+        WITH_TLS_PSK=no \
+        WITH_WEBSOCKETS=yes \
+        prefix=/usr \
+        binary && \
+    addgroup -S mosquitto 2>/dev/null && \
     adduser -S -D -H -h /var/empty -s /sbin/nologin -G mosquitto -g mosquitto mosquitto 2>/dev/null && \
     mkdir -p /mosquitto/config /mosquitto/data /mosquitto/log && \
-	install -d /usr/sbin/ && \
-	install -s -m755 /build/mosq/src/mosquitto /usr/sbin/mosquitto && \
-	install -s -m755 /build/mosq/src/mosquitto_passwd /usr/bin/mosquitto_passwd && \
-	install -m644 /build/mosq/mosquitto.conf /mosquitto/config/mosquitto.conf && \
+    install -d /usr/sbin/ && \
+    install -s -m755 /build/mosq/src/mosquitto /usr/sbin/mosquitto && \
+    install -s -m755 /build/mosq/src/mosquitto_passwd /usr/bin/mosquitto_passwd && \
+    install -m644 /build/mosq/mosquitto.conf /mosquitto/config/mosquitto.conf && \
     chown -R mosquitto:mosquitto /mosquitto && \
-	apk --no-cache add \
-      libuuid && \
-	apk del build-deps && \
-	rm -rf /build
+    apk --no-cache add \
+        libuuid && \
+    apk del build-deps && \
+    rm -rf /build
 
 VOLUME ["/mosquitto/data", "/mosquitto/log"]