diff --git a/tests/library/modernizr.spec.ts b/tests/library/modernizr.spec.ts
index 394ca484eb..ef47d88ad4 100644
--- a/tests/library/modernizr.spec.ts
+++ b/tests/library/modernizr.spec.ts
@@ -22,7 +22,7 @@ async function checkFeatures(name: string, context: any, server: any) {
     const page = await context.newPage();
     await page.goto(server.PREFIX + '/modernizr.html');
     const actual = await page.evaluate('window.report');
-    const expected = JSON.parse(fs.readFileSync(require.resolve(`./assets/modernizr/${name}.json`), 'utf-8'));
+    const expected = JSON.parse(fs.readFileSync(require.resolve(`../assets/modernizr/${name}.json`), 'utf-8'));
     return { actual, expected };
   } finally {
     await context.close();
diff --git a/utils/build/build.js b/utils/build/build.js
index 4d957996e5..f8c01a59fe 100644
--- a/utils/build/build.js
+++ b/utils/build/build.js
@@ -95,7 +95,7 @@ async function runWatch() {
       if (onChange.script)
         child_process.spawnSync('node', [onChange.script], { stdio: 'inherit' });
       else
-        child_process.spawnSync(onChange.command, onChange.args || [], { stdio: 'inherit', cwd: onChange.cwd });
+        child_process.spawnSync(onChange.command, onChange.args || [], { stdio: 'inherit', cwd: onChange.cwd, shell: true });
     }
     // chokidar will report all files as added in a sync loop, throttle those.
     const reschedule = () => {
@@ -166,7 +166,7 @@ async function runBuild() {
     if (onChange.script)
       runStep({ command: 'node', args: [filePath(onChange.script)], shell: false });
     else
-      runStep({ command: onChange.command, args: onChange.args, shell: false, cwd: onChange.cwd });
+      runStep({ command: onChange.command, args: onChange.args, shell: true, cwd: onChange.cwd });
   }
 }
 
@@ -265,7 +265,7 @@ onChanges.push({
   ],
   command: 'npx',
   args: ['vite', 'build'],
-  cwd: 'packages/trace-viewer',
+  cwd: path.join(__dirname, '..', '..', 'packages', 'trace-viewer'),
 });
 
 onChanges.push({
@@ -279,7 +279,7 @@ onChanges.push({
   ],
   command: 'npx',
   args: ['vite', 'build'],
-  cwd: 'packages/recorder',
+  cwd: path.join(__dirname, '..', '..', 'packages', 'recorder'),
 });
 
 // The recorder and trace viewer have an app_icon.png that needs to be copied.