diff --git a/fs/resources/test-helpers.js b/fs/resources/test-helpers.js
index d2e09504d3f611..7fa8bd2a8b4646 100644
--- a/fs/resources/test-helpers.js
+++ b/fs/resources/test-helpers.js
@@ -5,13 +5,9 @@ const kCurrentDirectory = '.';
 const kParentDirectory = '..';
 
 // Array of separators used to separate components in hierarchical paths.
-let kPathSeparators;
-if (navigator.userAgent.includes('Windows NT')) {
-  // Windows uses both '/' and '\' as path separators.
-  kPathSeparators = ['/', '\\'];
-} else {
-  kPathSeparators = ['/'];
-}
+// Consider both '/' and '\' as path separators to ensure file names are
+// platform-agnostic.
+let kPathSeparators = ['/', '\\'];
 
 async function getFileSize(handle) {
   const file = await handle.getFile();