diff --git a/docker/apt-install.sh b/docker/apt-install.sh
deleted file mode 100755
index b1a78dda3d7..00000000000
--- a/docker/apt-install.sh
+++ /dev/null
@@ -1,9 +0,0 @@
-#!/bin/sh
-
-apt-get update -q
-apt-get install -qy --no-install-recommends "$@"
-
-# Purge apt-get caches to minimize image size
-apt-get auto-remove -y
-apt-get clean -y
-rm -rf /var/lib/apt/lists/
diff --git a/docker/build.sh b/docker/build.sh
index ef7c6ae32a9..4002d783524 100755
--- a/docker/build.sh
+++ b/docker/build.sh
@@ -4,5 +4,4 @@ set -e
 set -x
 
 image="$1"
-cd $(dirname $0)
-docker build -f "$image/Dockerfile" -t "$image" .
+docker build -t "$image" "$(dirname $0)/$image"
diff --git a/docker/servo-x86_64-linux/Dockerfile b/docker/servo-x86_64-linux/Dockerfile
index 01780e7f20e..3b8edcf2123 100644
--- a/docker/servo-x86_64-linux/Dockerfile
+++ b/docker/servo-x86_64-linux/Dockerfile
@@ -1,13 +1,13 @@
 FROM ubuntu:bionic-20180821
 
-ADD apt-install.sh /apt-install.sh
-RUN /apt-install.sh \
+RUN apt-get update -q && apt-get install -qy --no-install-recommends \
         git \
         curl \
         ca-certificates \
         python2.7 \
         g++ \
     && \
+    rm -rf /var/lib/apt/lists/* && \
     curl https://sh.rustup.rs -sSf | sh -s -- --default-toolchain none -y
 
 ENV PATH="/root/.cargo/bin:${PATH}"