diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index 036f046..b5ce735 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -10,6 +10,10 @@ on:
     branches:
     - master
 
+defaults:
+  run:
+    shell: bash
+
 jobs:
   all:
     name: All
@@ -118,6 +122,22 @@ jobs:
         sudo apt-get install ripgrep
         ./bin/forbid
 
+    - name: Test Install Script With Explicit Target
+      if: matrix.os != 'windows-2016'
+      run: |
+        cd `mktemp -d`
+        cat $GITHUB_WORKSPACE/docs/install.sh | bash -s -- --target ${{ matrix.target }} --to .
+        if [[ ${{ matrix.native }} == true ]]; then
+          ./just --version
+        fi
+
+    - name: Test Install Script Without Explicit Target
+      if: matrix.os != 'windows-2016'
+      run: |
+        cd `mktemp -d`
+        cat $GITHUB_WORKSPACE/docs/install.sh | bash -s -- --to .
+        ./just --version
+
     - name: Package
       id: package
       if: startsWith(github.ref, 'refs/tags/')
diff --git a/docs/install.sh b/docs/install.sh
index fdaa189..416ba5e 100755
--- a/docs/install.sh
+++ b/docs/install.sh
@@ -1,19 +1,26 @@
 #!/usr/bin/env bash
 
-set -eu
+set -euo pipefail
+
+if [ ! -z ${GITHUB_ACTIONS-} ]; then
+  set -x
+fi
 
 help() {
   cat <<'EOF'
 Install a binary release of a just hosted on GitHub
 
-Usage:
+USAGE:
     install [options]
 
-Options:
+FLAGS:
     -h, --help      Display this message
     -f, --force     Force overwriting an existing binary
-    --tag TAG       Tag (version) of the crate to install (default <latest release>)
-    --to LOCATION   Where to install the binary (default ~/.cargo/bin)
+
+OPTIONS:
+    --tag TAG       Tag (version) of the crate to install, defaults to latest release
+    --to LOCATION   Where to install the binary [default: ~/.cargo/bin]
+    --target TARGET
 EOF
 }
 
@@ -22,18 +29,12 @@ crate=just
 url=https://github.com/casey/just
 releases=$url/releases
 
-case `uname -s` in
-  Darwin) target=x86_64-apple-darwin;;
-  Linux)  target=x86_64-unknown-linux-musl;;
-  *)      target=x86_64-pc-windows-msvc;;
-esac
-
 say() {
-  echo "install: $1"
+  echo "install: $@"
 }
 
 say_err() {
-  say "$1" >&2
+  say "$@" >&2
 }
 
 err() {
@@ -41,7 +42,7 @@ err() {
     rm -rf $td
   fi
 
-  say_err "ERROR $1"
+  say_err "error: $@"
   exit 1
 }
 
@@ -65,6 +66,10 @@ while test $# -gt 0; do
       tag=$2
       shift
       ;;
+    --target)
+      target=$2
+      shift
+      ;;
     --to)
       dest=$2
       shift
@@ -97,6 +102,20 @@ if [ -z ${tag-} ]; then
   tag=$(curl -s "$releases/latest" | cut -d'"' -f2 | rev | cut -d'/' -f1 | rev)
 fi
 
+if [ -z ${target-} ]; then
+  uname_target=`uname -m`-`uname -s`
+
+  case $uname_target in
+    aarch64-Linux)     target=aarch64-unknown-linux-gnu;;
+    x86_64-Darwin)     target=x86_64-apple-darwin;;
+    x86_64-Linux)      target=x86_64-unknown-linux-musl;;
+    x86_64-Windows_NT) target=x86_64-pc-windows-msvc;;
+    *)
+      err 'Could not determine target from output of `uname -m`-`uname -s`, please use `--target`:' $uname_target
+    ;;
+  esac
+fi
+
 archive="$releases/download/$tag/$crate-$tag-$target.tar.gz"
 
 say_err "Repository:  $url"
diff --git a/tests/shell.rs b/tests/shell.rs
index 2e526d2..412cb88 100644
--- a/tests/shell.rs
+++ b/tests/shell.rs
@@ -139,7 +139,6 @@ test! {
   shell: false,
 }
 
-#[cfg(unix)]
 test! {
   name: set_shell,
   justfile: "
@@ -156,21 +155,3 @@ test! {
   stderr: "echo bar\necho foo\n",
   shell: false,
 }
-
-#[cfg(windows)]
-test! {
-  name: set_shell,
-  justfile: "
-    set shell := ['echo', '-n']
-
-    x := `bar`
-
-    foo:
-      echo {{x}}
-      echo foo
-  ",
-  args: (),
-  stdout: "-n echo -n bar\r\r\n-n echo foo\r\n",
-  stderr: "echo -n bar\r\necho foo\n",
-  shell: false,
-}