diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 7539271..b7ab016 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -78,3 +78,20 @@ jobs:
         extra_nix_config: |
           experimental-features = nix-command flakes
     - run: nix flake show github:NixOS/nixpkgs
+
+  installer-options:
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - run: yarn install --frozen-lockfile
+    - run: yarn build
+    - name: Install Nix
+      uses: ./
+      with: 
+        nix_path: nixpkgs=channel:nixos-20.03
+        install_url: https://nix-ci.cachix.org/serve/lb41az54kzk6j12p81br4bczary7m145/install
+        install_options: '--tarball-url-prefix https://nix-ci.cachix.org/serve'
+    - run: nix-build test.nix
diff --git a/lib/install-nix.sh b/lib/install-nix.sh
index e701d69..fa097a8 100755
--- a/lib/install-nix.sh
+++ b/lib/install-nix.sh
@@ -28,7 +28,8 @@ installer_options=(
   --nix-extra-conf-file /tmp/nix.conf
 )
 if [[ $INPUT_INSTALL_OPTIONS != "" ]]; then
-  installer_options=("${installer_options[@]}" "${INPUT_INSTALL_OPTIONS[@]}")
+  IFS=' ' read -r -a extra_installer_options <<< $INPUT_INSTALL_OPTIONS
+  installer_options=("${extra_installer_options[@]}" "${installer_options[@]}")
 fi
 
 echo "installer options: ${installer_options[@]}"