diff --git a/src/package-manager.js b/src/package-manager.js
index a330cf87b..243f57da7 100644
--- a/src/package-manager.js
+++ b/src/package-manager.js
@@ -419,13 +419,17 @@ module.exports = class PackageManager {
 
     for (const packageDirPath of this.packageDirPaths) {
       if (fs.isDirectorySync(packageDirPath)) {
-        for (let packagePath of fs.readdirSync(packageDirPath)) {
-          packagePath = path.join(packageDirPath, packagePath);
-          const packageName = path.basename(packagePath);
+
+        const packagePaths = fs.readdirSync(packageDirPath, { withFileTypes: true })
+        .filter(dirent => dirent.isDirectory())
+        .map(dirent => dirent.name);
+
+        for (const packageName of packagePaths) {
           if (
             !packageName.startsWith('.') &&
             !packagesByName.has(packageName)
           ) {
+            const packagePath = path.join(packageDirPath, packageName);
             packages.push({
               name: packageName,
               path: packagePath,