diff --git a/tests/cli-package.test.mjs b/tests/cli-package.test.mjs
index 75d5549..bbe09e0 100644
--- a/tests/cli-package.test.mjs
+++ b/tests/cli-package.test.mjs
@@ -110,6 +110,7 @@ test('npm pack installs one platform-neutral CLI with its schema resource', () =
       cwd: repoRoot,
       env: npmEnv,
       encoding: 'utf8',
+      shell: process.platform === 'win32',
       stdio: ['ignore', 'pipe', 'pipe'],
     },
   ));
@@ -123,7 +124,13 @@ test('npm pack installs one platform-neutral CLI with its schema resource', () =
   execFileSync(
     npmCommand,
     ['install', '--global', '--prefix', prefix, tarball, '--ignore-scripts'],
-    { cwd: repoRoot, env: npmEnv, encoding: 'utf8', stdio: 'pipe' },
+    {
+      cwd: repoRoot,
+      env: npmEnv,
+      encoding: 'utf8',
+      shell: process.platform === 'win32',
+      stdio: 'pipe',
+    },
   );
 
   const installedBin = process.platform === 'win32'
diff --git a/tests/skill-doc-artifact.test.mjs b/tests/skill-doc-artifact.test.mjs
index fb06da0..e49c6ad 100644
--- a/tests/skill-doc-artifact.test.mjs
+++ b/tests/skill-doc-artifact.test.mjs
@@ -13,6 +13,7 @@ test('build:skill produces a docs-only skill that delegates execution to the CLI
   execFileSync(npmCommand, ['run', 'build:skill'], {
     cwd: repoRoot,
     encoding: 'utf8',
+    shell: process.platform === 'win32',
     stdio: 'pipe',
   });