diff --git a/.travis.yml b/.travis.yml
index 5b84ae5fd..7b3efe474 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,4 @@
+cache: cargo
 dist: trusty
 language: rust
 services: docker
@@ -45,13 +46,13 @@ install:
 script:
   - cargo generate-lockfile
   - if [[ $TRAVIS_OS_NAME = "linux" ]]; then
-      sudo apt-get remove -y qemu-user-static &&
-      sudo apt-get install -y qemu-user-static &&
       sh ci/run-docker.sh $TARGET;
     else
       cargo test --target $TARGET &&
       cargo test --target $TARGET --release;
     fi
+  # Travis can't cache files that are not readable by "others"
+  - chmod -R a+r $HOME/.cargo
 
 branches:
   only:
diff --git a/ci/docker/aarch64-unknown-linux-gnu/Dockerfile b/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
index 6a68154d1..d9a243fa2 100644
--- a/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/aarch64-unknown-linux-gnu/Dockerfile
@@ -5,6 +5,5 @@ RUN apt-get install -y --no-install-recommends \
   gcc-aarch64-linux-gnu libc6-dev-arm64-cross \
   qemu-user-static
 ENV CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/aarch64-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/arm-unknown-linux-gnueabi/Dockerfile b/ci/docker/arm-unknown-linux-gnueabi/Dockerfile
index 36efcd73c..cb4d021bb 100644
--- a/ci/docker/arm-unknown-linux-gnueabi/Dockerfile
+++ b/ci/docker/arm-unknown-linux-gnueabi/Dockerfile
@@ -4,7 +4,6 @@ RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates \
   gcc-arm-linux-gnueabi libc6-dev-armel-cross qemu-user-static
 ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABI_LINKER=arm-linux-gnueabi-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/arm-linux-gnueabi \
     RUST_TEST_THREADS=1
 
diff --git a/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile b/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
index 83e7e52e8..985abecea 100644
--- a/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
+++ b/ci/docker/arm-unknown-linux-gnueabihf/Dockerfile
@@ -4,6 +4,5 @@ RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates \
   gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user-static
 ENV CARGO_TARGET_ARM_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/arm-linux-gnueabihf \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile b/ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile
index adc15a5c5..94cae18cc 100644
--- a/ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile
+++ b/ci/docker/armv7-unknown-linux-gnueabihf/Dockerfile
@@ -4,6 +4,5 @@ RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates \
   gcc-arm-linux-gnueabihf libc6-dev-armhf-cross qemu-user-static
 ENV CARGO_TARGET_ARMV7_UNKNOWN_LINUX_GNUEABIHF_LINKER=arm-linux-gnueabihf-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/arm-linux-gnueabihf \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/i586-unknown-linux-gnu/Dockerfile b/ci/docker/i586-unknown-linux-gnu/Dockerfile
index 63450ff9e..3254b1a34 100644
--- a/ci/docker/i586-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/i586-unknown-linux-gnu/Dockerfile
@@ -2,4 +2,3 @@ FROM ubuntu:16.04
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc-multilib libc6-dev ca-certificates
-ENV PATH=$PATH:/rust/bin
diff --git a/ci/docker/i686-unknown-linux-gnu/Dockerfile b/ci/docker/i686-unknown-linux-gnu/Dockerfile
index 63450ff9e..3254b1a34 100644
--- a/ci/docker/i686-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/i686-unknown-linux-gnu/Dockerfile
@@ -2,4 +2,3 @@ FROM ubuntu:16.04
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc-multilib libc6-dev ca-certificates
-ENV PATH=$PATH:/rust/bin
diff --git a/ci/docker/mips-unknown-linux-gnu/Dockerfile b/ci/docker/mips-unknown-linux-gnu/Dockerfile
index 328152471..e332b5403 100644
--- a/ci/docker/mips-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/mips-unknown-linux-gnu/Dockerfile
@@ -7,6 +7,5 @@ RUN apt-get install -y --no-install-recommends \
         binfmt-support qemu-user-static qemu-system-mips
 
 ENV CARGO_TARGET_MIPS_UNKNOWN_LINUX_GNU_LINKER=mips-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/mips-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/mipsel-unknown-linux-gnu/Dockerfile b/ci/docker/mipsel-unknown-linux-gnu/Dockerfile
index 088c45f04..28f77be64 100644
--- a/ci/docker/mipsel-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/mipsel-unknown-linux-gnu/Dockerfile
@@ -7,6 +7,5 @@ RUN apt-get install -y --no-install-recommends \
         binfmt-support qemu-user-static
 
 ENV CARGO_TARGET_MIPSEL_UNKNOWN_LINUX_GNU_LINKER=mipsel-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/mipsel-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/powerpc-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
index 542afa2f4..8106728b9 100644
--- a/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc-unknown-linux-gnu/Dockerfile
@@ -7,6 +7,5 @@ RUN apt-get install -y --no-install-recommends \
         qemu-system-ppc
 
 ENV CARGO_TARGET_POWERPC_UNKNOWN_LINUX_GNU_LINKER=powerpc-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/powerpc-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
index f4559c7de..3259b4d92 100644
--- a/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc64-unknown-linux-gnu/Dockerfile
@@ -8,6 +8,5 @@ RUN apt-get install -y --no-install-recommends \
 
 ENV CARGO_TARGET_POWERPC64_UNKNOWN_LINUX_GNU_LINKER=powerpc64-linux-gnu-gcc \
     CC_powerpc64_unknown_linux_gnu=powerpc64-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/powerpc64-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile b/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
index 9a777883d..bd0a182a8 100644
--- a/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/powerpc64le-unknown-linux-gnu/Dockerfile
@@ -7,7 +7,5 @@ RUN apt-get install -y --no-install-recommends \
         qemu-system-ppc
 
 ENV CARGO_TARGET_POWERPC64LE_UNKNOWN_LINUX_GNU_LINKER=powerpc64le-linux-gnu-gcc \
-    CC_powerpc64le_unknown_linux_gnu=powerpc64le-linux-gnu-gcc \
-    PATH=$PATH:/rust/bin \
     QEMU_LD_PREFIX=/usr/powerpc64le-linux-gnu \
     RUST_TEST_THREADS=1
diff --git a/ci/docker/thumbv6m-none-eabi/Dockerfile b/ci/docker/thumbv6m-none-eabi/Dockerfile
index c6f7209f3..6f4997546 100644
--- a/ci/docker/thumbv6m-none-eabi/Dockerfile
+++ b/ci/docker/thumbv6m-none-eabi/Dockerfile
@@ -5,4 +5,3 @@ RUN apt-get install -y --no-install-recommends \
 ENV AR_thumbv6m_none_eabi=arm-none-eabi-ar \
     CARGO_TARGET_THUMBV6M_NONE_EABI_LINKER=arm-none-eabi-gcc \
     CC_thumbv6m_none_eabi=arm-none-eabi-gcc \
-    PATH=$PATH:/rust/bin
diff --git a/ci/docker/thumbv7em-none-eabi/Dockerfile b/ci/docker/thumbv7em-none-eabi/Dockerfile
index 016097b2e..5d26c9227 100644
--- a/ci/docker/thumbv7em-none-eabi/Dockerfile
+++ b/ci/docker/thumbv7em-none-eabi/Dockerfile
@@ -5,4 +5,3 @@ RUN apt-get install -y --no-install-recommends \
 ENV AR_thumbv7em_none_eabi=arm-none-eabi-ar \
     CARGO_TARGET_THUMBV7EM_NONE_EABI_LINKER=arm-none-eabi-gcc \
     CC_thumbv7em_none_eabi=arm-none-eabi-gcc \
-    PATH=$PATH:/rust/bin
diff --git a/ci/docker/thumbv7em-none-eabihf/Dockerfile b/ci/docker/thumbv7em-none-eabihf/Dockerfile
index c7188ef58..f223320c2 100644
--- a/ci/docker/thumbv7em-none-eabihf/Dockerfile
+++ b/ci/docker/thumbv7em-none-eabihf/Dockerfile
@@ -5,4 +5,3 @@ RUN apt-get install -y --no-install-recommends \
 ENV AR_thumbv7em_none_eabihf=arm-none-eabi-ar \
     CARGO_TARGET_THUMBV7EM_NONE_EABIHF_LINKER=arm-none-eabi-gcc \
     CC_thumbv7em_none_eabihf=arm-none-eabi-gcc \
-    PATH=$PATH:/rust/bin
diff --git a/ci/docker/thumbv7m-none-eabi/Dockerfile b/ci/docker/thumbv7m-none-eabi/Dockerfile
index 542cc9201..e0121034c 100644
--- a/ci/docker/thumbv7m-none-eabi/Dockerfile
+++ b/ci/docker/thumbv7m-none-eabi/Dockerfile
@@ -5,4 +5,3 @@ RUN apt-get install -y --no-install-recommends \
 ENV AR_thumbv7m_none_eabi=arm-none-eabi-ar \
     CARGO_TARGET_THUMBV7M_NONE_EABI_LINKER=arm-none-eabi-gcc \
     CC_thumbv7m_none_eabi=arm-none-eabi-gcc \
-    PATH=$PATH:/rust/bin
diff --git a/ci/docker/x86_64-unknown-linux-gnu/Dockerfile b/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
index a5704bb64..2ca8ee99c 100644
--- a/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
+++ b/ci/docker/x86_64-unknown-linux-gnu/Dockerfile
@@ -2,5 +2,3 @@ FROM ubuntu:16.04
 RUN apt-get update
 RUN apt-get install -y --no-install-recommends \
   gcc libc6-dev ca-certificates
-ENV PATH=$PATH:/rust/bin
-
diff --git a/ci/run-docker.sh b/ci/run-docker.sh
index 691271485..d80e75831 100644
--- a/ci/run-docker.sh
+++ b/ci/run-docker.sh
@@ -4,16 +4,27 @@
 set -ex
 
 run() {
-    echo $1
-    docker build -t $1 ci/docker/$1
+    local target=$1
+
+    echo $target
+
+    # This directory needs to exist before calling docker, otherwise docker will create it but it
+    # will be owned by root
+    mkdir -p target
+
+    docker build -t $target ci/docker/$target
     docker run \
-      -v `rustc --print sysroot`:/rust:ro \
-      -v `pwd`:/checkout:ro \
-      -e CARGO_TARGET_DIR=/tmp/target \
-      -w /checkout \
-      --privileged \
-      -it $1 \
-      sh ci/run.sh $1
+           --rm \
+           --user $(id -u):$(id -g) \
+           -e CARGO_HOME=/cargo \
+           -e CARGO_TARGET_DIR=/target \
+           -v $HOME/.cargo:/cargo \
+           -v `pwd`/target:/target \
+           -v `pwd`:/checkout:ro \
+           -v `rustc --print sysroot`:/rust:ro \
+           -w /checkout \
+           -it $target \
+           sh -c "PATH=\$PATH:/rust/bin ci/run.sh $target"
 }
 
 if [ -z "$1" ]; then
diff --git a/ci/run.sh b/ci/run.sh
old mode 100644
new mode 100755
index c0406e33f..206b2e9ed
--- a/ci/run.sh
+++ b/ci/run.sh
@@ -44,10 +44,9 @@ esac
 
 case $TRAVIS_OS_NAME in
     osx)
-        NM=gnm
-
         # NOTE OSx's nm doesn't accept the `--defined-only` or provide an equivalent.
         # Use GNU nm instead
+        NM=gnm
         brew install binutils
         ;;
     *)
@@ -56,7 +55,7 @@ case $TRAVIS_OS_NAME in
 esac
 
 # NOTE On i586, It's normal that the get_pc_thunk symbol appears several times so ignore it
-$PREFIX$NM -g --defined-only /tmp/target/${1}/debug/librustc_builtins.rlib | \
+$PREFIX$NM -g --defined-only /target/${1}/debug/librustc_builtins.rlib | \
     sort | uniq -d | grep -v __x86.get_pc_thunk | grep 'T __'
 
 if test $? = 0; then