diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index ba38895..bf2dc65 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,11 +16,15 @@ jobs:
       - run: pnpm run check
   action:
     name: 'Action'
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-latest, windows-latest]
+      fail-fast: false
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3
       - run: npm install -g pnpm
       - run: pnpm install
       - run: pnpm run build
-      - run: node dist/index.js
+      - uses: ./ # self
diff --git a/index.ts b/index.ts
index 2cc34b8..61f52ce 100644
--- a/index.ts
+++ b/index.ts
@@ -18,10 +18,9 @@ export async function installRustup() {
 
 	core.info('rustup does not exist, attempting to install');
 
-	const scriptPath = path.join(os.tmpdir(), 'rustup-init');
 	const script = await tc.downloadTool(
 		process.platform === 'win32' ? 'https://win.rustup.rs' : 'https://sh.rustup.rs',
-		scriptPath,
+		path.join(os.tmpdir(), 'rustup-init'),
 	);
 
 	core.info(`Downloaded installation script to ${script}`);