diff --git a/.github/workflows/test-install.yaml b/.github/workflows/test-install.yaml
new file mode 100644
index 00000000..612da005
--- /dev/null
+++ b/.github/workflows/test-install.yaml
@@ -0,0 +1,29 @@
+---
+name: Test install.sh
+
+on:
+  pull_request:
+    paths:
+      - .github/workflows/test-install.yaml
+      - install.sh
+
+jobs:
+  test-install-sh:
+    name: Test install.sh
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ['ubuntu-latest', 'macos-latest', 'windows-latest']
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install multi-gitter
+        env:
+          BINDIR: ${{ github.workspace }}/bin
+        run: |
+          curl -s https://raw.githubusercontent.com/${{ github.event.pull_request.head.repo.full_name }}/${{ github.head_ref }}/install.sh | sh -s -- -d
+          echo "${{ github.workspace }}/bin" >> $GITHUB_PATH
+        shell: sh
+      - name: Print version
+        run: multi-gitter version
+        shell: sh
diff --git a/install.sh b/install.sh
index 440c9912..aa5a89dd 100644
--- a/install.sh
+++ b/install.sh
@@ -8,7 +8,7 @@ usage() {
 $this: download go binaries for lindell/multi-gitter
 
 Usage: $this [-b] bindir [-d] [tag]
-  -b sets bindir or installation directory, Defaults to ./bin
+  -b sets bindir or installation directory, Defaults to /usr/local/bin
   -d turns on debug logging
    [tag] is a tag from
    https://github.com/lindell/multi-gitter/releases
@@ -51,14 +51,15 @@ execute() {
   (cd "${tmpdir}" && untar "${TARBALL}")
   test ! -d "${BINDIR}" && install -d "${BINDIR}"
   for binexe in $BINARIES; do
-    if [ "$OS" = "windows" ]; then
-      binexe="${binexe}.exe"
-    fi
-    if test -w "${BINDIR}/${binexe}"; then
-      install "${srcdir}/${binexe}" "${BINDIR}/${binexe}"
+    if [ "$OS" = "Windows" ]; then
+      install "${srcdir}/${binexe}.exe" "${BINDIR}/${binexe}.exe"
     else
-      log_info "not allowed to install binary without higher privilege"
-      sudo install "${srcdir}/${binexe}" "${BINDIR}/${binexe}"
+      if test -w "${BINDIR}/${binexe}"; then
+        install "${srcdir}/${binexe}" "${BINDIR}/${binexe}"
+      else
+        log_info "not allowed to install binary without higher privilege"
+        sudo install "${srcdir}/${binexe}" "${BINDIR}/${binexe}"
+      fi
     fi
     log_info "installed ${BINDIR}/${binexe}"
   done
@@ -99,13 +100,6 @@ tag_to_version() {
   TAG="$REALTAG"
   VERSION=${TAG#v}
 }
-adjust_format() {
-  # change format based on OS
-  case ${OS} in
-    windows) FORMAT=.exe ;;
-  esac
-  true
-}
 adjust_os() {
   # adjust archive name based on OS
   case ${OS} in
@@ -388,8 +382,6 @@ get_binaries
 
 tag_to_version
 
-adjust_format
-
 adjust_os
 
 adjust_arch