diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 4f9f7fa..7245337 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -120,8 +120,8 @@ jobs:
     - name: Check
       run: |
         node -v
-        node -e 'console.log(process.arch)'
         npm -v
+        if ((node -e 'console.log(process.arch)') -ne 'ia32') { exit 1 }
 
   # windows-nvmrc:
   #   runs-on: windows-latest
diff --git a/index.js b/index.js
index 1a44ead..e1ef50f 100644
--- a/index.js
+++ b/index.js
@@ -26,7 +26,7 @@ async function resolveVersion(version, mirror) {
   let mirror = core.getInput("node-mirror") || "https://nodejs.org/dist/";
   let version = await resolveVersion(core.getInput("node-version"), mirror);
   if (process.platform == "win32") {
-    let arch = core.getInput("node-arch") || null;
+    let arch = core.getInput("node-arch") || "";
     runScript("powershell", ".\\install.ps1", version, mirror, arch);
   } else {
     runScript("bash", "install.sh", version, mirror);